workspace: Add ctrl-w x support for vim (#42792)
Adds support for the vim CTRL-W x keybinding, which swaps the active
pane with the next adjacent one, prioritizing column over row and next
over previous. Upon swap, the pane which was swapped with is activated
(this is the vim behavior).
See also
ca6a260ef1/runtime/doc/windows.txt (L514C1-L521C24)
Release Notes:
- Added ctrl-w x keybinding in Vim mode, which swaps the active window
with the next adjacent one (aligning with Vim behavior)
**Vim behavior**
https://github.com/user-attachments/assets/435a8b52-5d1c-4d4b-964e-4f0f3c9aca31
https://github.com/user-attachments/assets/7aa40014-1eac-4cce-858f-516cd06d13f6
**Zed behavior**
https://github.com/user-attachments/assets/2431e860-4e11-45c6-a3f2-08f1a9b610c1
https://github.com/user-attachments/assets/30432d9d-5db1-4650-af30-232b1340229c
Note: There is a discrepancy where in Vim, if vertical and horizontal
splits are mixed, swapping from a column with a single window does not
work (see the vertical video), whilst in Zed it does. However, I don't
see a good reason as to why this should not be supported and would argue
that it makes more sense to keep the clear priority swap behavior,
instead of adding a workaround to supports such cases.
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Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>
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