Desktop: Improve macOS word navigation with Option+Arrow

[MANVENDRA-github]

Fixes #15149

Problem:
Joplin uses CodeMirror for editing, which does not automatically respect macOS system keybindings. As a result, standard macOS shortcuts like Option + Arrow may not behave consistently for word navigation.

Solution:
Adds a macOS-specific keymap override that maps:

1. Option + Right - move to next word
   2 Option + Left - move to previous word

[personalizedrefrigerator]

Note: Based on the documentation, it looks like this should be part of the standard CodeMirror keymap extension.

[coderabbitai]

Actionable comments posted: 2

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Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@packages/editor/CodeMirror/configFromSettings.ts`:
- Line 32: The change introduced an unnecessary blank line before the function
configFromSettings; revert that whitespace-only edit so the function
declaration's surrounding spacing matches the original style. Locate the
configFromSettings function in packages/editor/CodeMirror/configFromSettings.ts
and remove the extra newline so there are no added blank lines or
formatting-only changes.
- Line 13: Remove the duplicate registration of standardKeymap: delete the
import of standardKeymap from '@codemirror/commands' in configFromSettings.ts
and remove any code that adds standardKeymap to the keymap there (leave
defaultKeymap and emacsStyleKeymap as needed); createEditor.ts already registers
...standardKeymap in keymapConfig (Prec.low), so eliminating the import and
registration here prevents duplicate bindings and preserves intended precedence.

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• packages/editor/CodeMirror/configFromSettings.ts

[personalizedrefrigerator]

As a result, standard macOS shortcuts like Option + Arrow may not behave consistently for word navigation.

The linked issue seems to be about command+arrow (configured via a DefaultKeyBinding.dict file), not option+arrow. Is option+arrow also broken?

[MANVENDRA-github]

yeah option+arrow also seems to be broken lemme do a check and get back to you on this
i might have to properly go thru the doc aswell

[MANVENDRA-github]

I tested this on macOS (Tahoe 26.3.1) to verify the reported behavior of cmd + arrow and also the behavior of option + arrow.

In joplin:
option + arrow performs word navigation as expected (the CodeMirror default behavior) and cmd + arrow moves to the end of the line
I also created a ~/Library/Keybindings/DefaultKeyBinding.dict override to remap cmd + arrow to word navigation as the user mentioned he was doing
This override did not take effect even in native apps like TextEdit on my setup

Given this, it appears that:

option + arrow is functioning correctly
The expectation around cmd + arrow relies on macOS keybinding overrides that are not consistently applied, and in any case are not integrated into CodeMirror’s key handling

So this doesnt seem to be an issue specific to joplin its more of a feature request

Based on this, I’ve removed the previously added keymap changes (including the redundant standardKeymap registration) to align with CodeMirror’s default behavior and avoid introducing conflicts.

let me know if you’d like me to take a different approach here or if this should be treated as a separate feature discussion.

I have also asked the user for their macos version coz it seems to me that the DefaultKeyBinding.dict doesnt work properly in newer ones