1973476 - Dragging a tab outside the sidebar will result in a blank sidebar, which no longer shows the tab titles

Status: NEW

(Firefox :: Sidebar, defect)

Description

[Alexandru Trif, Desktop Test Engineering [:atrif]]

Attachment: tab_drag_0.gif

Found in

• 141.0a1 (2025-06-22)

Affected versions

• 141.0a1 (2025-06-02)

Tested platforms

• Affected platforms: Windows 10x6, Ubuntu 24, macOS 12
• Unaffected platforms: none

Preconditions

• vertical tabs enabled
• expand on hover enabled

Steps to reproduce

1. Drag a tab outside the sidebar area.

Expected result

• Sidebar visual closes or stays open until the drop is performed.

Actual result

• The sidebar closes, but the blank area remains with no tab titles until the drop is performed.

Regression range

• Pushlog: https://hg-edge.mozilla.org/integration/autoland/pushloghtml?fromchange=559d435750e29dbe7b4a4c8297f4222b596b14d5&tochange=fdd655561d6df0b7b96450a0aa34eb7e964e2f0a
• This happens after bug 1944907.

Additional notes

• Attached a screen recording.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

:nsharpley, since you are the author of the regressor, bug 1944907, could you take a look? Also, could you set the severity field?

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