2058458 - Compact / tiled mode triggered by opening the sidebar, doesn't revert when closing the sidebar until resizing the window

Status: RESOLVED FIXED

(Firefox :: Sidebar, defect, P2)

Description

[:Vincent]

Attachment: Screencast From 2026-07-28 13-09-38.webm

Steps to reproduce:

1. Resize Nightly window to be fairly small, but not so small that it triggers compact mode.
2. Press Ctrl+H to open the history sidebar, or Ctrl+B to open the bookmarks sidebar.
3. Observe that the spacing around the toolbars and content area disappears, and stays gone even if you close the sidebar again.

Bonus:

4. Slightly resize the window (larger or smaller doesn't matter).
5. Observe that the spacing around the toolbars and content area reappears.

See the attached screencast.

Comment 1

[Kelly Cochrane [:kcochrane]]

Attachment: Bug 2058458 - Ensure auto-compact mode works as expected when opening/closing the sidebar

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/d14a34421f95
https://hg.mozilla.org/integration/autoland/rev/5c9f073bbfb6
Ensure auto-compact mode works as expected when opening/closing the sidebar r=jsudiaman

Comment 3

[Cosmin Sabou [:CosminS]]

https://hg.mozilla.org/mozilla-central/rev/5c9f073bbfb6