782262 - window content incompletely refreshed when zooming

Status: RESOLVED WORKSFORME

(Core :: Graphics: Layers, defect)

Description

[Jonathan Kew [:jfkthame]]

Attachment: screenshot showing incomplete refresh after zooming

When zooming in a window that has been zoomed out, sometimes a band of content across the top of the window is not refreshed, so the old differently-scaled content remains visible.

I can reproduce this on current Nightly (FF17) and Aurora (16), but not on Beta (15) or release versions.

STR (shows the issue reliably for me on MacBook Pro):
* Load a bugzilla page such as this one.
* Press Cmd-0 (command-zero) to ensure the page is at default zoom level.
* Press Cmd-- (command-minus) five times to zoom out completely.
* Press Cmd-= (command-equals) once to zoom back in by one step.
At this point, I see a strip of unrefreshed content across the top of the window, as in the attached screenshot.

Alternative STR, equally reliable for me:
* Load about:home and reset zoom to default.
* Zoom out (Cmd-minus) four times, then in (Cmd-equals) twice.
Note the residue of the zoomed-out word "mozilla" at top right of the window.

This reproduces both with and without hardware acceleration enabled.

(Filing this in Graphics, but I suppose it could also be Widget or Layout-related.)

Comment 1

[Jonathan Kew [:jfkthame]]

After my Aurora and Nightly builds updated themselves, I can no longer reproduce this. So apparently it's been fixed in the last few days - closing, sorry for the spam!