Open Bug 786486 Opened 12 years ago Updated 2 years ago

Moving the cursor on an about:newtab thumbnail causes multiple repaints of the thumbnail

Categories

(Core :: Widget, defect)

x86_64
Windows 7
defect

Tracking

()

People

(Reporter: marco, Unassigned)

Details

(Whiteboard: [Snappy])

Enabling nglayout.debug.paint_flashing shows the issue.
Thumbnails have a default opacity of 0.8 (or the like) and when hovering they fade into full opacity. That definitely requires more than one repaint. I can't see any superfluous repaints when moving the cursor over the new tab page - all I see is the opacity transitions on :hover.
I see multiple repaints, I don't know how many. And I don't know if the number of the repaints I see is more than the necessary or not.
One of the repaints happens nearly one second after I move the cursor out of the thumbnail (or above).

Feel free to close the bug if there's nothing to do here.
Severity: normal → S3
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