1984632 - When moving cursor from inside the window to outside or outside window to inside sidebar can stay open

Status: NEW

(Firefox :: Sidebar, defect, P3)

Description

[Wanyal]

Attachment: A video recording demonstrating the issue

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:144.0) Gecko/20100101 Firefox/144.0

Steps to reproduce:

1. Enable Vertical Tabs
2. Enable Expand sidebar on hover
3. Move the cursor from inside the window across the sidebar to outside the window

Alternatively:

1. Enable Vertical Tabs
2. Enable Expand sidebar on hover
3. Move the cursor from outside the window across the sidebar to inside the window

Actual results:

At certain speeds, the sidebar expands but does not collapse after the cursor moves away from the sidebar without touching it.

Expected results:

The sidebar should collapse after the cursor moves away from the sidebar without touching it.

Comment 1

[BugBot [:suhaib / :marco]]

The Bugbug bot thinks this bug should belong to the 'Firefox::Sidebar' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Ina Popescu, Desktop QA]

I was able to reproduce this issue in Nightly 144.0a1 on macOS15 following the steps from Comment 0. Marking as NEW.