More fixes.
Keeping on knocking out the most reported problems.
Fixes:
- Bottom tab is no longer cut off. ✂️ (Fixes #238.)
- Don't double-wrap the telemetry ping. 📞🏡 (Fixes #327.)
- Remove the white bar from the titlebar. 📶 (Fixes #319.)
- Allow onunload trigger to resolve before animating tab close. ❌🔜 (Fixes #317.)
- Keep sidebar expanded when hovering over context menu. ⏭ (Fixes #287, #312.)
- Don't show unidentified buttons in the tab's toolbar. (Fixes #4, #304.)
- Remove margin from popups. (Fixes #135.)