Kitty 0.14.6 Rendering Glitch with NeoVim and Tmux

[peterpme]

Hi, I love Kitty!

This repainting issue will happen from time to time:

This is what it's supposed to look like:

The way I fix it is by scrolling the part out of view and scrolling back up.

• kitty 0.14.6
• tmux 2.9a
• Nvim 0.4.2
• Catalina, but this issue was taking place before upgrading too.

Here is my kitty config. The only thing that I uncommented out is the font size and font_family (Liga Iosevka, a patched font that includes Fira Code's ligatures)

Thank you!

# vim:fileencoding=utf-8:ft=conf:foldmethod=marker

#: Fonts {{{

#: kitty has very powerful font management. You can configure
#: individual font faces and even specify special fonts for particular
#: characters.

font_family      Liga Iosevka
# bold_font        auto
# italic_font      auto
# bold_italic_font auto

#: You can specify different fonts for the bold/italic/bold-italic
#: variants. To get a full list of supported fonts use the `kitty
#: list-fonts` command. By default they are derived automatically, by
#: the OSes font system. Setting them manually is useful for font
#: families that have many weight variants like Book, Medium, Thick,
#: etc. For example::

#     font_family      Operator Mono Book
#     bold_font        Operator Mono Medium
#     italic_font      Operator Mono Book Italic
#     bold_italic_font Operator Mono Medium Italic

font_size 16.0

#: Font size (in pts)

# adjust_line_height  0
# adjust_column_width 0

#: Change the size of each character cell kitty renders. You can use
#: either numbers, which are interpreted as pixels or percentages
#: (number followed by %), which are interpreted as percentages of the
#: unmodified values. You can use negative pixels or percentages less
#: than 100% to reduce sizes (but this might cause rendering
#: artifacts).

# symbol_map U+E0A0-U+E0A2,U+E0B0-U+E0B3 PowerlineSymbols

#: Map the specified unicode codepoints to a particular font. Useful
#: if you need special rendering for some symbols, such as for
#: Powerline. Avoids the need for patched fonts. Each unicode code
#: point is specified in the form U+<code point in hexadecimal>. You
#: can specify multiple code points, separated by commas and ranges
#: separated by hyphens. symbol_map itself can be specified multiple
#: times. Syntax is::

#:     symbol_map codepoints Font Family Name

# disable_ligatures never

#: Choose how you want to handle multi-character ligatures. The
#: default is to always render them.  You can tell kitty to not render
#: them when the cursor is over them by using cursor to make editing
#: easier, or have kitty never render them at all by using always, if
#: you don't like them. The ligature strategy can be set per-window
#: either using the kitty remote control facility or by defining
#: shortcuts for it in kitty.conf, for example::

#:     map alt+1 disable_ligatures_in active always
#:     map alt+2 disable_ligatures_in all never
#:     map alt+3 disable_ligatures_in tab cursor

# box_drawing_scale 0.001, 1, 1.5, 2

#: Change the sizes of the lines used for the box drawing unicode
#: characters These values are in pts. They will be scaled by the
#: monitor DPI to arrive at a pixel value. There must be four values
#: corresponding to thin, normal, thick, and very thick lines.

#: }}}

#: Cursor customization {{{

# cursor #cccccc

#: Default cursor color

# cursor_text_color #111111

#: Choose the color of text under the cursor. If you want it rendered
#: with the background color of the cell underneath instead, use the
#: special keyword: background

# cursor_shape block

#: The cursor shape can be one of (block, beam, underline)

# cursor_blink_interval -1

#: The interval (in seconds) at which to blink the cursor. Set to zero
#: to disable blinking. Negative values mean use system default. Note
#: that numbers smaller than repaint_delay will be limited to
#: repaint_delay.

# cursor_stop_blinking_after 15.0

#: Stop blinking cursor after the specified number of seconds of
#: keyboard inactivity.  Set to zero to never stop blinking.

#: }}}

#: Scrollback {{{

# scrollback_lines 2000

#: Number of lines of history to keep in memory for scrolling back.
#: Memory is allocated on demand. Negative numbers are (effectively)
#: infinite scrollback. Note that using very large scrollback is not
#: recommended as it can slow down resizing of the terminal and also
#: use large amounts of RAM.

# scrollback_pager less --chop-long-lines --RAW-CONTROL-CHARS +INPUT_LINE_NUMBER

#: Program with which to view scrollback in a new window. The
#: scrollback buffer is passed as STDIN to this program. If you change
#: it, make sure the program you use can handle ANSI escape sequences
#: for colors and text formatting. INPUT_LINE_NUMBER in the command
#: line above will be replaced by an integer representing which line
#: should be at the top of the screen.

# scrollback_pager_history_size 0

#: Separate scrollback history size, used only for browsing the
#: scrollback buffer (in MB). This separate buffer is not available
#: for interactive scrolling but will be piped to the pager program
#: when viewing scrollback buffer in a separate window. The current
#: implementation stores one character in 4 bytes, so approximatively
#: 2500 lines per megabyte at 100 chars per line. A value of zero or
#: less disables this feature. The maximum allowed size is 4GB.

# wheel_scroll_multiplier 5.0

#: Modify the amount scrolled by the mouse wheel. Note this is only
#: used for low precision scrolling devices, not for high precision
#: scrolling on platforms such as macOS and Wayland. Use negative
#: numbers to change scroll direction.

# touch_scroll_multiplier 1.0

#: Modify the amount scrolled by a touchpad. Note this is only used
#: for high precision scrolling devices on platforms such as macOS and
#: Wayland. Use negative numbers to change scroll direction.

#: }}}

#: Mouse {{{

# mouse_hide_wait 3.0

#: Hide mouse cursor after the specified number of seconds of the
#: mouse not being used. Set to zero to disable mouse cursor hiding.
#: Set to a negative value to hide the mouse cursor immediately when
#: typing text.

# url_color #0087bd
# url_style curly

#: The color and style for highlighting URLs on mouse-over. url_style
#: can be one of: none, single, double, curly

# open_url_modifiers kitty_mod

#: The modifier keys to press when clicking with the mouse on URLs to
#: open the URL

# open_url_with default

#: The program with which to open URLs that are clicked on. The
#: special value default means to use the operating system's default
#: URL handler.

# copy_on_select no

#: Copy to clipboard or a private buffer on select. With this set to
#: clipboard, simply selecting text with the mouse will cause the text
#: to be copied to clipboard. Useful on platforms such as macOS that
#: do not have the concept of primary selections. You can instead
#: specify a name such as a1 to copy to a private kitty buffer
#: instead. Map a shortcut with the paste_from_buffer action to paste
#: from this private buffer. For example::

#:     map cmd+shift+v paste_from_buffer a1

#: Note that copying to the clipboard is a security risk, as all
#: programs, including websites open in your browser can read the
#: contents of the system clipboard.

# strip_trailing_spaces never

#: Remove spaces at the end of lines when copying to clipboard. A
#: value of smart will do it when using normal selections, but not
#: rectangle selections. always will always do it.

# rectangle_select_modifiers ctrl+alt

#: The modifiers to use rectangular selection (i.e. to select text in
#: a rectangular block with the mouse)

# terminal_select_modifiers shift

#: The modifiers to override mouse selection even when a terminal
#: application has grabbed the mouse

# select_by_word_characters :@-./_~?&=%+#

#: Characters considered part of a word when double clicking. In
#: addition to these characters any character that is marked as an
#: alphanumeric character in the unicode database will be matched.

# click_interval -1.0

#: The interval between successive clicks to detect double/triple
#: clicks (in seconds). Negative numbers will use the system default
#: instead, if available, or fallback to 0.5.

# focus_follows_mouse no

#: Set the active window to the window under the mouse when moving the
#: mouse around

# pointer_shape_when_grabbed arrow

#: The shape of the mouse pointer when the program running in the
#: terminal grabs the mouse.

#: }}}

#: Performance tuning {{{

 repaint_delay 60

#: Delay (in milliseconds) between screen updates. Decreasing it,
#: increases frames-per-second (FPS) at the cost of more CPU usage.
#: The default value yields ~100 FPS which is more than sufficient for
#: most uses. Note that to actually achieve 100 FPS you have to either
#: set sync_to_monitor to no or use a monitor with a high refresh
#: rate. Also, to minimize latency when there is pending input to be
#: processed, repaint_delay is ignored.

# input_delay 3

#: Delay (in milliseconds) before input from the program running in
#: the terminal is processed. Note that decreasing it will increase
#: responsiveness, but also increase CPU usage and might cause flicker
#: in full screen programs that redraw the entire screen on each loop,
#: because kitty is so fast that partial screen updates will be drawn.

# sync_to_monitor yes

#: Sync screen updates to the refresh rate of the monitor. This
#: prevents tearing (https://en.wikipedia.org/wiki/Screen_tearing)
#: when scrolling. However, it limits the rendering speed to the
#: refresh rate of your monitor. With a very high speed mouse/high
#: keyboard repeat rate, you may notice some slight input latency. If
#: so, set this to no.

#: }}}

#: Terminal bell {{{

# enable_audio_bell yes

#: Enable/disable the audio bell. Useful in environments that require
#: silence.

# visual_bell_duration 0.0

#: Visual bell duration. Flash the screen when a bell occurs for the
#: specified number of seconds. Set to zero to disable.

# window_alert_on_bell yes

#: Request window attention on bell. Makes the dock icon bounce on
#: macOS or the taskbar flash on linux.

# bell_on_tab yes

#: Show a bell symbol on the tab if a bell occurs in one of the
#: windows in the tab and the window is not the currently focused
#: window

# command_on_bell none

#: Program to run when a bell occurs.

#: }}}

#: Window layout {{{

# remember_window_size  yes
# initial_window_width  640
# initial_window_height 400

#: If enabled, the window size will be remembered so that new
#: instances of kitty will have the same size as the previous
#: instance. If disabled, the window will initially have size
#: configured by initial_window_width/height, in pixels. You can use a
#: suffix of "c" on the width/height values to have them interpreted
#: as number of cells instead of pixels.

# enabled_layouts *

#: The enabled window layouts. A comma separated list of layout names.
#: The special value all means all layouts. The first listed layout
#: will be used as the startup layout. For a list of available
#: layouts, see the
#: https://sw.kovidgoyal.net/kitty/index.html#layouts.

# window_resize_step_cells 2
# window_resize_step_lines 2

#: The step size (in units of cell width/cell height) to use when
#: resizing windows. The cells value is used for horizontal resizing
#: and the lines value for vertical resizing.

# window_border_width 1.0

#: The width (in pts) of window borders. Will be rounded to the
#: nearest number of pixels based on screen resolution. Note that
#: borders are displayed only when more than one window is visible.
#: They are meant to separate multiple windows.

# draw_minimal_borders yes

#: Draw only the minimum borders needed. This means that only the
#: minimum needed borders for inactive windows are drawn. That is only
#: the borders that separate the inactive window from a neighbor. Note
#: that setting a non-zero window margin overrides this and causes all
#: borders to be drawn.

# window_margin_width 0.0

#: The window margin (in pts) (blank area outside the border)

# single_window_margin_width -1000.0

#: The window margin (in pts) to use when only a single window is
#: visible. Negative values will cause the value of
#: window_margin_width to be used instead.

# window_padding_width 0.0

#: The window padding (in pts) (blank area between the text and the
#: window border)

# placement_strategy center

#: When the window size is not an exact multiple of the cell size, the
#: cell area of the terminal window will have some extra padding on
#: the sides. You can control how that padding is distributed with
#: this option. Using a value of center means the cell area will be
#: placed centrally. A value of top-left means the padding will be on
#: only the bottom and right edges.

# active_border_color #00ff00

#: The color for the border of the active window. Set this to none to
#: not draw borders around the active window.

# inactive_border_color #cccccc

#: The color for the border of inactive windows

# bell_border_color #ff5a00

#: The color for the border of inactive windows in which a bell has
#: occurred

# inactive_text_alpha 1.0

#: Fade the text in inactive windows by the specified amount (a number
#: between zero and one, with zero being fully faded).

hide_window_decorations yes

#: Hide the window decorations (title-bar and window borders). Whether
#: this works and exactly what effect it has depends on the window
#: manager/operating system.

# resize_debounce_time 0.1

#: The time (in seconds) to wait before redrawing the screen when a
#: resize event is received. On platforms such as macOS, where the
#: operating system sends events corresponding to the start and end of
#: a resize, this number is ignored.

# resize_draw_strategy static

#: Choose how kitty draws a window while a resize is in progress. A
#: value of static means draw the current window contents, mostly
#: unchanged. A value of scale means draw the current window contents
#: scaled. A value of blank means draw a blank window. A value of size
#: means show the window size in cells.

#: }}}

#: Tab bar {{{

# tab_bar_edge bottom

#: Which edge to show the tab bar on, top or bottom

# tab_bar_margin_width 0.0

#: The margin to the left and right of the tab bar (in pts)

# tab_bar_style fade

#: The tab bar style, can be one of: fade, separator or hidden. In the
#: fade style, each tab's edges fade into the background color, in the
#: separator style, tabs are separated by a configurable separator.

# tab_bar_min_tabs 2

#: The minimum number of tabs that must exist before the tab bar is
#: shown

# tab_switch_strategy previous

#: The algorithm to use when switching to a tab when the current tab
#: is closed. The default of previous will switch to the last used
#: tab. A value of left will switch to the tab to the left of the
#: closed tab. A value of last will switch to the right-most tab.

# tab_fade 0.25 0.5 0.75 1

#: Control how each tab fades into the background when using fade for
#: the tab_bar_style. Each number is an alpha (between zero and one)
#: that controls how much the corresponding cell fades into the
#: background, with zero being no fade and one being full fade. You
#: can change the number of cells used by adding/removing entries to
#: this list.

# tab_separator " ┇"

#: The separator between tabs in the tab bar when using separator as
#: the tab_bar_style.

# tab_title_template {title}

#: A template to render the tab title. The default just renders the
#: title. If you wish to include the tab-index as well, use something
#: like: {index}: {title}. Useful if you have shortcuts mapped for
#: goto_tab N.

# active_tab_foreground   #000
# active_tab_background   #eee
# active_tab_font_style   bold-italic
# inactive_tab_foreground #444
# inactive_tab_background #999
# inactive_tab_font_style normal

#: Tab bar colors and styles

#: }}}

#: Color scheme {{{

# foreground #dddddd
# background #000000

#: The foreground and background colors

# background_opacity 1.0

#: The opacity of the background. A number between 0 and 1, where 1 is
#: opaque and 0 is fully transparent.  This will only work if
#: supported by the OS (for instance, when using a compositor under
#: X11). Note that it only sets the default background color's
#: opacity. This is so that things like the status bar in vim,
#: powerline prompts, etc. still look good.  But it means that if you
#: use a color theme with a background color in your editor, it will
#: not be rendered as transparent.  Instead you should change the
#: default background color in your kitty config and not use a
#: background color in the editor color scheme. Or use the escape
#: codes to set the terminals default colors in a shell script to
#: launch your editor.  Be aware that using a value less than 1.0 is a
#: (possibly significant) performance hit.  If you want to dynamically
#: change transparency of windows set dynamic_background_opacity to
#: yes (this is off by default as it has a performance cost)

# dynamic_background_opacity no

#: Allow changing of the background_opacity dynamically, using either
#: keyboard shortcuts (increase_background_opacity and
#: decrease_background_opacity) or the remote control facility.

# dim_opacity 0.75

#: How much to dim text that has the DIM/FAINT attribute set. One
#: means no dimming and zero means fully dimmed (i.e. invisible).

# selection_foreground #000000

#: The foreground for text selected with the mouse. A value of none
#: means to leave the color unchanged.

# selection_background #fffacd

#: The background for text selected with the mouse.


#: The 16 terminal colors. There are 8 basic colors, each color has a
#: dull and bright version. You can also set the remaining colors from
#: the 256 color table as color16 to color255.

# color0 #000000
# color8 #767676

#: black

# color1 #cc0403
# color9 #f2201f

#: red

# color2  #19cb00
# color10 #23fd00

#: green

# color3  #cecb00
# color11 #fffd00

#: yellow

# color4  #0d73cc
# color12 #1a8fff

#: blue

# color5  #cb1ed1
# color13 #fd28ff

#: magenta

# color6  #0dcdcd
# color14 #14ffff

#: cyan

# color7  #dddddd
# color15 #ffffff

#: white

#: }}}

#: Advanced {{{

# shell .

#: The shell program to execute. The default value of . means to use
#: whatever shell is set as the default shell for the current user.
#: Note that on macOS if you change this, you might need to add
#: --login to ensure that the shell starts in interactive mode and
#: reads its startup rc files.

# editor .

#: The console editor to use when editing the kitty config file or
#: similar tasks. A value of . means to use the environment variable
#: EDITOR. Note that this environment variable has to be set not just
#: in your shell startup scripts but system-wide, otherwise kitty will
#: not see it.

# close_on_child_death no

#: Close the window when the child process (shell) exits. If no (the
#: default), the terminal will remain open when the child exits as
#: long as there are still processes outputting to the terminal (for
#: example disowned or backgrounded processes). If yes, the window
#: will close as soon as the child process exits. Note that setting it
#: to yes means that any background processes still using the terminal
#: can fail silently because their stdout/stderr/stdin no longer work.

# allow_remote_control no

#: Allow other programs to control kitty. If you turn this on other
#: programs can control all aspects of kitty, including sending text
#: to kitty windows, opening new windows, closing windows, reading the
#: content of windows, etc. Note that this even works over ssh
#: connections.

# env 

#: Specify environment variables to set in all child processes. Note
#: that environment variables are expanded recursively, so if you
#: use::

#:     env MYVAR1=a
#:     env MYVAR2=${MYVAR1}/${HOME}/b

#: The value of MYVAR2 will be a/<path to home directory>/b.

# update_check_interval 24

#: Periodically check if an update to kitty is available. If an update
#: is found a system notification is displayed informing you of the
#: available update. The default is to check every 24 hrs, set to zero
#: to disable.

# startup_session none

#: Path to a session file to use for all kitty instances. Can be
#: overridden by using the kitty --session command line option for
#: individual instances. See
#: https://sw.kovidgoyal.net/kitty/index.html#sessions in the kitty
#: documentation for details. Note that relative paths are interpreted
#: with respect to the kitty config directory. Environment variables
#: in the path are expanded.

# clipboard_control write-clipboard write-primary

#: Allow programs running in kitty to read and write from the
#: clipboard. You can control exactly which actions are allowed. The
#: set of possible actions is: write-clipboard read-clipboard write-
#: primary read-primary. You can additionally specify no-append to
#: disable kitty's protocol extension for clipboard concatenation. The
#: default is to allow writing to the clipboard and primary selection
#: with concatenation enabled. Note that enabling the read
#: functionality is a security risk as it means that any program, even
#: one running on a remote server via SSH can read your clipboard.

# term xterm-kitty

#: The value of the TERM environment variable to set. Changing this
#: can break many terminal programs, only change it if you know what
#: you are doing, not because you read some advice on Stack Overflow
#: to change it. The TERM variable is used by various programs to get
#: information about the capabilities and behavior of the terminal. If
#: you change it, depending on what programs you run, and how
#: different the terminal you are changing it to is, various things
#: from key-presses, to colors, to various advanced features may not
#: work.

#: }}}

#: OS specific tweaks {{{

# macos_titlebar_color system

#: Change the color of the kitty window's titlebar on macOS. A value
#: of system means to use the default system color, a value of
#: background means to use the background color of the currently
#: active window and finally you can use an arbitrary color, such as
#: #12af59 or red. WARNING: This option works by using a hack, as
#: there is no proper Cocoa API for it. It sets the background color
#: of the entire window and makes the titlebar transparent. As such it
#: is incompatible with background_opacity. If you want to use both,
#: you are probably better off just hiding the titlebar with
#: hide_window_decorations.

# macos_option_as_alt no

#: Use the option key as an alt key. With this set to no, kitty will
#: use the macOS native Option+Key = unicode character behavior. This
#: will break any Alt+key keyboard shortcuts in your terminal
#: programs, but you can use the macOS unicode input technique. You
#: can use the values: left, right, or both to use only the left,
#: right or both Option keys as Alt, instead.

# macos_hide_from_tasks no

#: Hide the kitty window from running tasks (Option+Tab) on macOS.

# macos_quit_when_last_window_closed no

#: Have kitty quit when all the top-level windows are closed. By
#: default, kitty will stay running, even with no open windows, as is
#: the expected behavior on macOS.

# macos_window_resizable yes

#: Disable this if you want kitty top-level (OS) windows to not be
#: resizable on macOS.

# macos_thicken_font 0

#: Draw an extra border around the font with the given width, to
#: increase legibility at small font sizes. For example, a value of
#: 0.75 will result in rendering that looks similar to sub-pixel
#: antialiasing at common font sizes.

# macos_traditional_fullscreen no

#: Use the traditional full-screen transition, that is faster, but
#: less pretty.

# macos_show_window_title_in all

#: Show or hide the window title in the macOS window or menu-bar. A
#: value of window will show the title of the currently active window
#: at the top of the macOS window. A value of menubar will show the
#: title of the currently active window in the macOS menu-bar, making
#: use of otherwise wasted space. all will show the title everywhere
#: and none hides the title in the window and the menu-bar.

# macos_custom_beam_cursor no

#: Enable/disable custom mouse cursor for macOS that is easier to see
#: on both light and dark backgrounds. WARNING: this might make your
#: mouse cursor invisible on dual GPU machines.

# linux_display_server auto

#: Choose between Wayland and X11 backends. By default, an appropriate
#: backend based on the system state is chosen automatically. Set it
#: to x11 or wayland to force the choice.

#: }}}

#: Keyboard shortcuts {{{

#: For a list of key names, see: GLFW keys
#: <https://www.glfw.org/docs/latest/group__keys.html>. The name to
#: use is the part after the GLFW_KEY_ prefix. For a list of modifier
#: names, see: GLFW mods
#: <https://www.glfw.org/docs/latest/group__mods.html>

#: On Linux you can also use XKB key names to bind keys that are not
#: supported by GLFW. See XKB keys
#: <https://github.com/xkbcommon/libxkbcommon/blob/master/xkbcommon/xkbcommon-
#: keysyms.h> for a list of key names. The name to use is the part
#: after the XKB_KEY_ prefix. Note that you should only use an XKB key
#: name for keys that are not present in the list of GLFW keys.

#: Finally, you can use raw system key codes to map keys. To see the
#: system key code for a key, start kitty with the kitty --debug-
#: keyboard option. Then kitty will output some debug text for every
#: key event. In that text look for ``native_code`` the value of that
#: becomes the key name in the shortcut. For example:

#: .. code-block:: none

#:     on_key_input: glfw key: 65 native_code: 0x61 action: PRESS mods: 0x0 text: 'a'

#: Here, the key name for the A key is 0x61 and you can use it with::

#:     map ctrl+0x61 something

#: to map ctrl+a to something.

#: You can use the special action no_op to unmap a keyboard shortcut
#: that is assigned in the default configuration::

#:     map kitty_mod+space no_op

#: You can combine multiple actions to be triggered by a single
#: shortcut, using the syntax below::

#:     map key combine <separator> action1 <separator> action2 <separator> action3 ...

#: For example::

#:     map kitty_mod+e combine : new_window : next_layout

#: this will create a new window and switch to the next available
#: layout

#: You can use multi-key shortcuts using the syntax shown below::

#:     map key1>key2>key3 action

#: For example::

#:     map ctrl+f>2 set_font_size 20

# kitty_mod ctrl+shift

#: The value of kitty_mod is used as the modifier for all default
#: shortcuts, you can change it in your kitty.conf to change the
#: modifiers for all the default shortcuts.

# clear_all_shortcuts no

#: You can have kitty remove all shortcut definition seen up to this
#: point. Useful, for instance, to remove the default shortcuts.

# kitten_alias hints hints --hints-offset=0

#: You can create aliases for kitten names, this allows overriding the
#: defaults for kitten options and can also be used to shorten
#: repeated mappings of the same kitten with a specific group of
#: options. For example, the above alias changes the default value of
#: kitty +kitten hints --hints-offset to zero for all mappings,
#: including the builtin ones.

#: Clipboard {{{

# map kitty_mod+c copy_to_clipboard

#: There is also a copy_or_interrupt action that can be optionally
#: mapped to Ctrl+c. It will copy only if there is a selection and
#: send an interrupt otherwise.

# map cmd+c        copy_to_clipboard
# map kitty_mod+v  paste_from_clipboard
# map cmd+v        paste_from_clipboard
# map kitty_mod+s  paste_from_selection
# map shift+insert paste_from_selection
# map kitty_mod+o  pass_selection_to_program

#: You can also pass the contents of the current selection to any
#: program using pass_selection_to_program. By default, the system's
#: open program is used, but you can specify your own, the selection
#: will be passed as a command line argument to the program, for
#: example::

#:     map kitty_mod+o pass_selection_to_program firefox

#: You can pass the current selection to a terminal program running in
#: a new kitty window, by using the @selection placeholder::

#:     map kitty_mod+y new_window less @selection

#: }}}

#: Scrolling {{{

# map kitty_mod+up        scroll_line_up
# map alt+cmd+page_up     scroll_line_up
# map cmd+up              scroll_line_up
# map kitty_mod+k         scroll_line_up
# map kitty_mod+down      scroll_line_down
# map kitty_mod+j         scroll_line_down
# map alt+cmd+page_down   scroll_line_down
# map cmd+down            scroll_line_down
# map kitty_mod+page_up   scroll_page_up
# map cmd+page_up         scroll_page_up
# map kitty_mod+page_down scroll_page_down
# map cmd+page_down       scroll_page_down
# map kitty_mod+home      scroll_home
# map cmd+home            scroll_home
# map kitty_mod+end       scroll_end
# map cmd+end             scroll_end
# map kitty_mod+h         show_scrollback

#: You can pipe the contents of the current screen + history buffer as
#: STDIN to an arbitrary program using the ``pipe`` function. For
#: example, the following opens the scrollback buffer in less in an
#: overlay window::

#:     map f1 pipe @ansi overlay less +G -R

#: For more details on piping screen and buffer contents to external
#: programs, see pipe.

#: }}}

#: Window management {{{

# map kitty_mod+enter new_window

#: You can open a new window running an arbitrary program, for
#: example::

#:     map kitty_mod+y      new_window mutt

#: You can open a new window with the current working directory set to
#: the working directory of the current window using::

#:     map ctrl+alt+enter    new_window_with_cwd

#: You can open a new window that is allowed to control kitty via the
#: kitty remote control facility by prefixing the command line with @.
#: Any programs running in that window will be allowed to control
#: kitty. For example::

#:     map ctrl+enter new_window @ some_program

#: You can open a new window next to the currently active window or as
#: the first window, with::

#:     map ctrl+n new_window !neighbor some_program
#:     map ctrl+f new_window !first some_program

# map cmd+enter   new_window
# map kitty_mod+n new_os_window

#: Works like new_window above, except that it opens a top level OS
#: kitty window. In particular you can use new_os_window_with_cwd to
#: open a window with the current working directory.

# map cmd+n       new_os_window
# map kitty_mod+w close_window
# map shift+cmd+d close_window
# map kitty_mod+] next_window
# map kitty_mod+[ previous_window
# map kitty_mod+f move_window_forward
# map kitty_mod+b move_window_backward
# map kitty_mod+` move_window_to_top
# map kitty_mod+r start_resizing_window
# map cmd+r       start_resizing_window
# map kitty_mod+1 first_window
# map cmd+1       first_window
# map kitty_mod+2 second_window
# map cmd+2       second_window
# map kitty_mod+3 third_window
# map cmd+3       third_window
# map kitty_mod+4 fourth_window
# map cmd+4       fourth_window
# map kitty_mod+5 fifth_window
# map cmd+5       fifth_window
# map kitty_mod+6 sixth_window
# map cmd+6       sixth_window
# map kitty_mod+7 seventh_window
# map cmd+7       seventh_window
# map kitty_mod+8 eighth_window
# map cmd+8       eighth_window
# map kitty_mod+9 ninth_window
# map cmd+9       ninth_window
# map kitty_mod+0 tenth_window
#: }}}

#: Tab management {{{

# map kitty_mod+right next_tab
# map ctrl+tab        next_tab
# map shift+cmd+]     next_tab
# map kitty_mod+left  previous_tab
# map shift+ctrl+tab  previous_tab
# map shift+cmd+[     previous_tab
# map kitty_mod+t     new_tab
# map cmd+t           new_tab
# map kitty_mod+q     close_tab
# map cmd+w           close_tab
# map kitty_mod+.     move_tab_forward
# map kitty_mod+,     move_tab_backward
# map kitty_mod+alt+t set_tab_title
# map shift+cmd+i     set_tab_title

#: You can also create shortcuts to go to specific tabs, with 1 being
#: the first tab, 2 the second tab and -1 being the previously active
#: tab::

#:     map ctrl+alt+1 goto_tab 1
#:     map ctrl+alt+2 goto_tab 2

#: Just as with new_window above, you can also pass the name of
#: arbitrary commands to run when using new_tab and use
#: new_tab_with_cwd. Finally, if you want the new tab to open next to
#: the current tab rather than at the end of the tabs list, use::

#:     map ctrl+t new_tab !neighbor [optional cmd to run]
#: }}}

#: Layout management {{{

# map kitty_mod+l next_layout

#: You can also create shortcuts to switch to specific layouts::

#:     map ctrl+alt+t goto_layout tall
#:     map ctrl+alt+s goto_layout stack

#: Similarly, to switch back to the previous layout::

#:    map ctrl+alt+p last_used_layout
#: }}}

#: Font sizes {{{

#: You can change the font size for all top-level kitty OS windows at
#: a time or only the current one.

# map kitty_mod+equal     change_font_size all +2.0
# map cmd+plus            change_font_size all +2.0
# map kitty_mod+minus     change_font_size all -2.0
# map cmd+minus           change_font_size all -2.0
# map kitty_mod+backspace change_font_size all 0
# map cmd+0               change_font_size all 0

#: To setup shortcuts for specific font sizes::

#:     map kitty_mod+f6 change_font_size all 10.0

#: To setup shortcuts to change only the current OS window's font
#: size::

#:     map kitty_mod+f6 change_font_size current 10.0
#: }}}

#: Select and act on visible text {{{

#: Use the hints kitten to select text and either pass it to an
#: external program or insert it into the terminal or copy it to the
#: clipboard.

# map kitty_mod+e kitten hints

#: Open a currently visible URL using the keyboard. The program used
#: to open the URL is specified in open_url_with.

# map kitty_mod+p>f kitten hints --type path --program -

#: Select a path/filename and insert it into the terminal. Useful, for
#: instance to run git commands on a filename output from a previous
#: git command.

# map kitty_mod+p>shift+f kitten hints --type path

#: Select a path/filename and open it with the default open program.

# map kitty_mod+p>l kitten hints --type line --program -

#: Select a line of text and insert it into the terminal. Use for the
#: output of things like: ls -1

# map kitty_mod+p>w kitten hints --type word --program -

#: Select words and insert into terminal.

# map kitty_mod+p>h kitten hints --type hash --program -

#: Select something that looks like a hash and insert it into the
#: terminal. Useful with git, which uses sha1 hashes to identify
#: commits


#: The hints kitten has many more modes of operation that you can map
#: to different shortcuts. For a full description see kittens/hints.
#: }}}

#: Miscellaneous {{{

# map kitty_mod+f11    toggle_fullscreen
# map kitty_mod+f10    toggle_maximized
# map kitty_mod+u      kitten unicode_input
# map kitty_mod+f2     edit_config_file
# map kitty_mod+escape kitty_shell window

#: Open the kitty shell in a new window/tab/overlay/os_window to
#: control kitty using commands.

# map kitty_mod+a>m    set_background_opacity +0.1
# map kitty_mod+a>l    set_background_opacity -0.1
# map kitty_mod+a>1    set_background_opacity 1
# map kitty_mod+a>d    set_background_opacity default
# map kitty_mod+delete clear_terminal reset active

#: You can create shortcuts to clear/reset the terminal. For example::

#:     # Reset the terminal
#:     map kitty_mod+f9 clear_terminal reset active
#:     # Clear the terminal screen by erasing all contents
#:     map kitty_mod+f10 clear_terminal clear active
#:     # Clear the terminal scrollback by erasing it
#:     map kitty_mod+f11 clear_terminal scrollback active
#:     # Scroll the contents of the screen into the scrollback
#:     map kitty_mod+f12 clear_terminal scroll active

#: If you want to operate on all windows instead of just the current
#: one, use all instead of active.

#: It is also possible to remap Ctrl+L to both scroll the current
#: screen contents into the scrollback buffer and clear the screen,
#: instead of just clearing the screen::

#:     map ctrl+l combine : clear_terminal scroll active : send_text normal,application \x0c


#: You can tell kitty to send arbitrary (UTF-8) encoded text to the
#: client program when pressing specified shortcut keys. For example::

#:     map ctrl+alt+a send_text all Special text

#: This will send "Special text" when you press the ctrl+alt+a key
#: combination.  The text to be sent is a python string literal so you
#: can use escapes like \x1b to send control codes or \u21fb to send
#: unicode characters (or you can just input the unicode characters
#: directly as UTF-8 text). The first argument to send_text is the
#: keyboard modes in which to activate the shortcut. The possible
#: values are normal or application or kitty or a comma separated
#: combination of them.  The special keyword all means all modes. The
#: modes normal and application refer to the DECCKM cursor key mode
#: for terminals, and kitty refers to the special kitty extended
#: keyboard protocol.

#: Another example, that outputs a word and then moves the cursor to
#: the start of the line (same as pressing the Home key)::

#:     map ctrl+alt+a send_text normal Word\x1b[H
#:     map ctrl+alt+a send_text application Word\x1bOH

#: }}}

# }}}

include ./theme.conf

[kovidgoyal]

Trying to debug the combination of tmux and nvim is way too much work. Does
it happen without tmux? In general make sure TERM is still xterm-kitty
inside tmux.

[vp1981]

Hello,
my problem may be totally unrelated to current issue but sometimes (actually always but I don't remember when I noticed this effect as only recently I began to use kitty) when in bash I press C-r (reverse-search-history) and then either movement combination, for example, C-e the line is screwed up and only C-l would help. This is NOT inside tmux, only in new kitty tab, the TERM is xterm-kitty, kitty version is 0.14.6, video --- intel graphics.

I attached screenshot of terminal line after I did C-r and then C-e.
. After the C-e the cursor must be at the end of a line and the line will be redrawn correctly if I press C-l. But even then if I press Home and C-k line wouldn't be correct, only after next C-l.

[vp1981]

Also, I see the same effect in ssh session but not always.

[juanibiapina]

xterm-kitty outside tmux, screen-256color inside tmux. Sometimes I also get glitches outside nvim. Terminal characters all go crazy.

[kovidgoyal]

Use xterm-kittyinside tmus as well and you should be fine.

[peterpme]

Thank you!

[juanibiapina]

This feels like a weird recommendation, but I'll test it for a few days to see what happens.

[peterpme]

FWIW none of my friends are using xterm-kitty inside their kitty/zsh/tmux setup so it just might be something specific to my setup. I'll investigate & report!

Thanks again

[juanibiapina]

As expected changing the terminal to xterm-kitty inside tmux does not solve the problem. It did not cause any further problems (my expectation is that it should cause problems), but the rendering remains broken.

[juanibiapina]

Also it's easily fixable by closing kitty and opening it again, even using the exact same tmux session.

[kovidgoyal]

@juanibiapina I dont know what your issue is, my recommendation was for the original poster. "Characters all going crazy" is about as useless a problem description as I have ever heard. If you wish some help, at least make the minimum effort of posting a screenshot along with details of your operating system, the output of kitty --debug-config and ideally some way to reproduce your isse with minimal configs of all software involved.

[juanibiapina]

My problem is similar to the one reported by the OP. Also I think he made quite an effort to share a screenshot and his config, along with one way that he was able to solve it. I also contributed two more pieces of information given my knowledge. If you had requested more information before closing the issue I'm sure both me and OP would have provided.

Instead you have now replied aggressively. There have been cases before where you did that. This kind of behavior is not acceptable.

[peterpme]

Hey fellas, no problem 😅

We'll figure this out together! I know that my issue is a little tricky because it works for all of friends, except for me right now.

I will continue investigating until I can offer more valuable feedback :)

[kovidgoyal]

Instead you have now replied aggressively. There have been cases before where you did that. This kind of behavior is not acceptable.

Then please leave. People that make minimum effort posts and expect me to jump through hoops to help them are not acceptable.

[kovidgoyal]

@peterpme If I were you I would bisect the configs of the involved software: kitty, shell, nvim, tmux until finding the culprit.

[SliceThePi]

Hi, I'm encountering this as well. Here's my setup, which I've tested using clean configs for tmux 3.1, vim 8.0, and kitty 0.14.6, and which works on UXTerm:

• I have a tmux session with a horizontal split (i.e. left pane and right pane) (tmux new-session -s wrapper)
• The left pane is running a nested tmux session (TMUX= tmux new-session -s inner), in which there is only one pane visible in the active window

To replicate:

• run vim in the nested session
• open any help doc (:h) (in theory, other vertical splits would also work, but this is quick)
• hold down j until the help doc begins scrolling, and the only the bottom line will properly update.

This does not occur if any of the following is true:

• if the wrapper session pane is full-width (i.e. closing the right pane will fix this issue)
• if the inner session window is not full-width (i.e. creating another horizontal split inside the nested session will actually fix this issue)
• if vim is run in a window split and not in a fully-nested tmux session
• if the vertical split inside Vim is a real file and not a fake buffer
• if the scrolling shortcut you use moves the cursor upwards (if the cursor is NOT on the top line of the window, hitting CTRL-E will properly scroll, but will visually glitch as soon as the cursor is at the top)
• if you scroll up, not down

Vim-specific workarounds:

• hitting CTRL-L will properly redraw the vim window
• scrolling up a line will do the same
• using my mouse to scroll works fine

Detaching from and reattaching to the wrapper session will work, but isn't an acceptable solution considering how consistently this comes up.

To clarify, this bug:

• is definitely not an issue with vim, as I've confirmed that a UXTerm window viewing this at the same time (tmux attach-session -t wrapper) will update the screen properly, regardless of which of the two windows I use to scroll
• is almost certainly not an issue with tmux's compatibility with TERM=xterm-kitty, as UXTerm will actually render properly even when I run TERM=xterm-kitty tmux attach-session -t wrapper
• may be an issue with how tmux handles redrawing full-width panes, but it's working on other terminal apps, so that still doesn't seem likely to me

[SliceThePi]

Whoops, sorry, I should have done a ping here. @kovidgoyal I can confirm that this bug is still present. Steps to reproduce are in my previous comment.

Also, I should have mentioned my UXTerm version. Running uxterm -version prints XTerm(330).

[kovidgoyal]

@SliceThePi Sadly those steps dont reproduce the issue for me. To be precise

1. kitty tmux new-session -s wrapper
2. Ctrl+b % and Ctrl+b left
3. TMUX= tmux new-session -s inner
4. vim
5. :h
6. Press Ctrl+E to scroll
   No rendering artifacts

[SliceThePi]

To be clear, the vim command I ran was :h, not :vert h. It looks like the terminology around vertical/horizontal splits is swapped in vim vs. tmux.

[kovidgoyal]

Using :h instead of :vert h does not reproduce it either.

[maricn]

For all the confused souls that end up here - it's not kitty's fault.

1. Make your coc.nvim use single unicode character emojis in diagnostic. You can see characters for emojis here: https://github.com/yatli/fvim/blob/master/emoji.tsv. Tip comes from Emoji modifiers are broken neovim/neovim#7151 (comment).
2. Check if disabling nerdfont.vim or vim-devicons plugins helps.

🍀

[lucypero]

I just installed Kitty to try it out and I came across this problem right away. I do not use tmux. Does not happen on alacritty.

Video Link

[kaiz0711]

it's not tmux or neovim or kitty's problem it's the system
If you are using zsh or basrc
export LANGUAGE=en_US.UTF-8
export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8
export LC_TYPE=en_US.UTF-8
I have tried and succeeded

[acesaro]

FWIW, I disabled the kyazdani42/nvim-web-devicons plugin in my Neovim init.vim and the problem went away. This is after reading the suggestion by @maricn above.

[taraslis453]

I have the same issue with lualine.nvim plugin. Disabling fixed this.

[aikakira]

it's not tmux or neovim or kitty's problem it's the system If you are using zsh or basrc export LANGUAGE=en_US.UTF-8 export LC_ALL=en_US.UTF-8 export LANG=en_US.UTF-8 export LC_TYPE=en_US.UTF-8 I have tried and succeeded

Thank you so much! I had issues after moving from Gnome to KDE and Tmux wasn't showing any ligatures, this solved it!