1733700 - Mouse pointer instability with css cursor (esp. over Remote Desktop)

Status: UNCONFIRMED

(Core :: DOM: UI Events & Focus Handling, defect)

Description

[cleek]

Attachment: foo.htm

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0

Steps to reproduce:

Save the attached HTML file.

Open it in Firefox, over a Windows Remote Desktop connection.

(Both PCs on Windows 10, current Firefox builds. Happens a few builds, back, too)

Actual results:

When the mouse pointer moves over that blue div, the cursor will jump around and flash (looks like it's jumping between current position and position a fraction of a second ago). You can see the flash, barely, without RDP. But in RDP, it makes many pages utterly unusable.

It is clearly tied to css cursors. Just disabling the custom cursor spec in affected pages makes them usable.

Expected results:

Cursor should not jump around erratically.

Comment 1

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

The Bugbug bot thinks this bug should belong to the 'Core::Layout' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 2

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

The severity field is not set for this bug.
:TYLin, could you have a look please?

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