Fix ruler overwriting neighboring split pane + fix crash #3052 #3069
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When we resize a split pane to a very small width, so that the gutter does not fit in the pane, it overwrites the sibling split pane. To fix it, clean up the calculation of gutter width, buffer width and scrollbar width, so that they add up exactly to the window width, and ensure that we don't draw the gutter beyond this calculated gutter width (gutterOffset). As a bonus, this also fixes the crash zyedidia#3052 (observed when resizing a split pane to a very small width, if wordwrap is enabled), by ensuring that bufWidth is never negative. [*] By the gutter we mean of course gutter + diffgutter + ruler.
If softwrap is enabled, the line numbers displayed in the ruler depend on the heights of the displayed softwrapped lines, which depend on the width of the displayed buffer. If this width is 0 (e.g. after resizing buffer pane to a very small width), there is no displayed text at all, so line numbers don't make sense. So don't display line numbers in this case.
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When we resize a split pane to a very small width, so that the ruler does not fit in the pane, it overwrites the sibling split pane.
To fix it, clean up the calculation of gutter width, buffer width and scrollbar width, so that they add up exactly to the window width, and ensure that we don't draw the gutter beyond this calculated gutter
width (gutterOffset).
As a bonus, this also fixes the crash #3052 (observed when resizing a split pane to a very small width, if wordwrap is enabled), by ensuring that bufWidth is never negative.
Fixes #3052