1960311 - Sidebar collapses before the mouse pointer reaches the edge

Status: NEW

(Firefox :: Sidebar, defect, P3)

Description

[Catalin Sasca, Desktop Test Engineering [:csasca]]

Attachment: sidebar panel edge.webm

Found in

• Firefox 138.0b6
• Firefox 139.0a1

Affected versions

• Firefox 138.0b6
• Firefox 139.0a1

Tested platforms

• Affected platforms: macOS, Windows, Ubuntu

Preconditions

• sidebar.revamp: true
• sidebar.expandOnHover: true
• vertical tabs enabled
• expand sidebar on hover enabled

Steps to reproduce

1. Hover over sidebar
2. Exit the sidebar on the right edge

Expected result

• The panel collapses only after the mouse has exited the sidebar area completely

Actual result

• The sidebar collapses before the mouse is at the edge

Regression range

• Not a regression

Additional notes

• The issue can be seen in the attachment