[Webkit-unassigned] [Bug 42105] New: Glitchy rendering in Gmail

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=42105

           Summary: Glitchy rendering in Gmail
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: s+webkit at sidneysm.com


I'm reluctant to submit this bug, since I haven't been able to reduce it, and cannot reproduce it on other machines. It appeared a number of months ago. I'm going to describe the symptoms as accurately as I can, in the hope that they'll ring a bell with someone before it makes it into the wild and affects more users.

So far, the issue only appears to affect Gmail.

1. When anything changes on the page (a menu is opened, an email is opened or closed), I can see the change "paint" in strips from the bottom and right edges over the course of a fraction of a second.
2. The insertion point does not blink in plain text fields, and when I move it, it appears to stay in its old location until I start typing. The insertion point *does* blink in rich text fields (contenteditable).
3. When I switch from the tab containing Gmail to another tab and back, the page is blank. I can still move my mouse and see the cursor change, and I can interact with the page (e.g. move messages around with keyboard commands), though nothing I do is visible. This part of the issue comes and goes. It's a problem for a few days, then it isn't. When it is not a problem, the page can be seen to be "painted", like in issue 1, over white, when its tab is selected.

Any ideas?

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