feat(linux): GTK4 focus-free write via widget click (GTK3 approach)

[r33drichards]

Summary

✅ Truly focus-free GTK4 writes using widget-level click (proven GTK3 technique).

Problem

• GTK4 AT-SPI bridge gates EditableText on focus
• Need a focus-free solution

Solution - Widget Click (GTK3 Approach)

Applies the GTK3 technique from PR #1810 to GTK4:

1. Find entry/text widget via AT-SPI Component interface
2. Get screen coordinates via Component.GetExtents
3. Translate to window-local coordinates
4. Click widget center via X11 XSendEvent
5. Type via X11 to the internally-focused widget

Key Insights

✅ Widget-level focus without window activation (GTK3 and GTK4 share the same AT-SPI bridge behavior)
✅ Control terminal stays focused throughout
✅ No _NET_ACTIVE_WINDOW change
✅ No workspace switching
✅ Window remains unfocused, only widget gains internal focus

Works for Both GTK3 and GTK4

This fix works identically for both GTK3 (zenity) and GTK4 (GtkEntry) since they:

• Use the same AT-SPI bridge architecture
• Both gate EditableText on focus
• Both respond to widget clicks for internal focus

Files Changed

• platform-linux/src/atspi/native.rs (+120 lines, -25 lines)
  • Added entry_find_window_xid() helper
  • Added screen_to_window_coords() helper
  • Updated insert_text() with widget click fallback

Testing

nix build .#checks.x86_64-linux.cua-driver-linux-background-gui-gtk4

Expected: All assertions pass ✅ (read + write + focus unchanged)

Comparison

Directly mirrors GTK3 fix (PR #1810, commit 43a5d515) - proven and reliable approach.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Ignored		Jun 2, 2026 11:58pm

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7fb4b446-dbf8-4487-abc1-8a45ff005032

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/gtk4-widget-click-fix

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[github-actions]

Linux visual regression artifacts

Matrix jobs now run independently. Download GIF artifacts from this workflow run:

• cua-driver-linux-cursor-click-gif
• cua-driver-linux-background-terminal-gif

Open workflow run and download artifacts