Option-left/right do not reposition the cursor correctly

[ianthehenry]

Describe the bug
Alt-left/right behave differently than native macOS text editing controls.

To reproduce
Text like this (pipe is cursor):

hello.|

Press alt-left. See that the cursor is here:

hello|.

Expected behavior

Cursor should be here:

|hello.

Environment:

Zed 0.42.0 – /Applications/Zed.app
macOS 12.3.1
architecture x86_64

[filippo-orru]

To add some more context, the default MacOS navigation treats the dot as part of the word, but sublime text behaves a bit differently:

hello.|  
// press alt left
|hello.
// press alt right
hello|.
// press alt right
hello.|

It's only treated as a stop while navigating right.

[mikayla-maki]

Thats actually pretty smart. Alt key modifier basically meaning ‘semantic navigation mode’ and the arrow keys taking you to the nearest useful word boundary. Interesting. Very cool seeing all the little inconsistencies between these tools.

[notpeter]

I don't think we want to match macOS by default, but perhaps we can offer that as an option to support multiple word boundary movement types.

[remorses]

I really need this feature, compared to VSCode having to press the arrow keys on every dot slows you down a lot

[remorses]

PR with implementation: #31977