1958193 - Quickly moving the mouse away after the expand-on-hover animation starts will cause the sidebar launcher to expand and collapse rapidly

Status: RESOLVED DUPLICATE of bug 1957008

(Firefox :: Sidebar, defect)

Description

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

Attachment: expand_good.gif

Found in

• 138.0b2

Affected versions

• 139.0a1 (2025-04-02)
• 138.0b2

Tested platforms

• Affected platforms: Windows 10x64, macOS
• Unaffected platforms: none

Preconditions

• sidebar enabled
• vertical tab enabled
• sidebar placed on the left side
• expand on hover enabled

Steps to reproduce

1. Hover over the sidebar launcher.
2. When the expand animation starts, quickly move the mouse away from the sidebar launcher.

Expected result

• The sidebar launcher expands and collapses smoothly.

Actual result

• The sidebar launcher quickly expands and collapses.

Regression range

• Mozregression points at bug 1950419.

Additional notes

• Attached a screen recording.

Comment 1

[BugBot [:suhaib / :marco]]

:kcochrane, since you are the author of the regressor, bug 1950419, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 2

[Kelly Cochrane [:kcochrane]]

This is the same thing going on in bug 1957008 regardless of the very slightly different way to reproduce. :atrif if you want to update the description of the other bug to mention this other way to reproduce, feel free!