Support Ctrl Modifier for Word Navigation and Deletion in Text Areas

[iskandergaba]

PR Description

Unlike lazygit, most text editors and TUIs support Ctrl based key bindings for word navigation and deletion. They also support forward word deletion. As a heavy user of these key bindings, I wanted to extend their support to lazygit to switch between tools more easily.

I am sure that I am not the only one who would appreciate this, and in any case, this extension does not break any preexisting key bindings.

Changes:

• Ctrl+Left / Ctrl+Right: Move cursor one word left/right (alongside existing Alt+Left/Right and Emacs-style Alt+B/Alt+F)
• Ctrl+Backspace: delete word to the left (alongside existing Alt+Backspace and Ctrl+W)
• Ctrl+Delete / Alt+D: Delete word to the right (new; no equivalent existed before)

Note:

ModCtrl was previously disabled in gocui with a comment stating it didn't work with keyboard keys. This comment was written 5 years ago and mentions tcell.v1 while the project is currently using tcell.v2, so I suspect it is a bit legacy now, but I would like it if the maintainers double-checked that part. I managed to make ModCtrl work by patching tcell_driver.go to preserve it for right/left and deletion key events while keeping it stripped from all other ones, as before.

Please Check If the PR Fulfills these Requirements

• Cheatsheets are up-to-date (run go generate ./...)
• Code has been formatted (see here)
• Tests have been added/updated (see here for the integration test guide)
• Text is internationalized (see here)
• If a new UserConfig entry was added, make sure it can be hot-reloaded (see here)
• Docs have been updated if necessary
• You've read through your own file changes for silly mistakes etc.