fix(patch): cherry-pick 82c1042 to release/v0.12.0-preview.2-pr-12231 to patch version v0.12.0-preview.2 and create version 0.12.0-preview.3

[gemini-cli-robot]

This PR automatically cherry-picks commit 82c1042 to patch version v0.12.0-preview.2 in the preview release to create version 0.12.0-preview.3.

[gemini-code-assist]

Summary of Changes

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This pull request introduces a targeted fix for how specific Alt-key combinations are processed on macOS within the CLI. It refines the input handling to correctly interpret Alt+b, Alt+f, and Alt+m as their intended actions, such as navigating words or toggling markup, by mapping the unique characters produced by these keypresses on Mac. This change ensures consistent and expected keyboard shortcut behavior for macOS users, accompanied by updated documentation and dedicated test cases.

Highlights

• Refined macOS Alt-key Handling: Specific Alt key combinations (Alt+b, Alt+f, Alt+m) on macOS are now correctly interpreted as their intended actions (back word, forward word, toggle markup view) by remapping their special character outputs (∫, ƒ, µ).
• Platform-Specific Remapping: The Alt-key character remapping logic is now explicitly applied only when running on macOS (process.platform === 'darwin'), preventing unintended behavior on other operating systems.
• Updated Documentation: The keyboard-shortcuts.md file has been updated to include a new section detailing the Meta+key (Alt-key on Mac) combos and their special functionalities.
• Improved Test Coverage: Tests for cross-terminal Alt-key handling have been enhanced and now explicitly simulate a macOS environment to ensure the correct behavior of the remapping logic.

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[gemini-code-assist]

Code Review

This pull request cherry-picks a fix for handling Alt+key combinations on macOS terminals. The changes are well-implemented and improve the existing logic. The large, generic ALT_KEY_CHARACTER_MAP has been correctly replaced with a smaller, more specific MAC_ALT_KEY_CHARACTER_MAP that only includes mappings for shortcuts used by the CLI. The logic is now correctly scoped to run only on darwin platforms. The accompanying test changes are also excellent, mocking process.platform to ensure the tests are reliable and specific to the macOS behavior. The documentation has also been updated to reflect these changes. Overall, this is a solid fix and I have no further recommendations.

[github-actions]

Size Change: -251 B (0%)

Total Size: 20.2 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	20.2 MB	-251 B (0%)
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB	0 B
./bundle/sandbox-macos-permissive-open.sb	890 B	0 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB	0 B
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB	0 B
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB	0 B
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB	0 B

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