[Webkit-unassigned] [Bug 75682] New: Regression (r98735): Video chat moles in Gmail render incorrectly on Mac OS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=75682

           Summary: Regression (r98735): Video chat moles in Gmail render
                    incorrectly on Mac OS
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P1
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kbr at google.com
                CC: simon.fraser at apple.com, cmarrin at apple.com,
                    jamesr at chromium.org, vangelis at chromium.org
        Depends on: 38829


Created an attachment (id=121387)
 --> (https://bugs.webkit.org/attachment.cgi?id=121387&action=review)
Screen shot of correct behavior (from Safari 5.1.2)

(This is filed in Chromium as http://code.google.com/p/chromium/issues/detail?id=107283 .)

http://trac.webkit.org/changeset/98735/ introduced a regression where video chat moles in Gmail render incorrectly on Mac OS. Some of the elements of the chat mole do not render. See attached correct and incorrect screen shots from Safari; the incorrect one contains the composited layer borders. The problem is present in both Safari and Chromium. It is provoked by the embedded Core Animation plugin containing the video, though the problem is not related to plugins specifically. It can be triggered by forcing creation of a layer for one of the sub-elements of the chat mole using the Inspector.

I don't yet have a reduced test case but am continuing to investigate in order to create one. In the meantime, the failure can be reproduced in the following ways:

With video:

1) Install the Google Talk Video plugin from http://www.google.com/chat/video .
2) Log into Gmail.
3) In the gear menu in the upper right corner, select "Labs".
4) Enable the "Video Chat Enhancements" lab. (This isn't strictly needed but I was having problems getting video to work at all without it -- likely an unrelated Flash problem.)
5) Establish a chat connection to echocall at bot.talk.google.com and click the video camera icon.
6) When the video comes up, click the arrow pointing down and to the right to shrink the large video window into the chat mole.

Note that the text field and border of the chat mole disappear. This is the bug.

Without video:

1) Log into Gmail.
2) Establish a chat connection to echocall at bot.talk.google.com .
3) Type a little text.
4) Right-click some of the text and select "Inspect element".
5) In the style for the element, add the property "-webkit-transform: translateZ(0)".

The chat mole disappears entirely, leaving only the inspected element visible.

It seems that the visibility of some of the elements and/or their layers is being computed incorrectly.

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