957077 - Tweetdeck panels stop rendering and/or disappear in Metro mode

Status: RESOLVED INCOMPLETE

(Core :: Panning and Zooming, defect)

Description

[Chris Lord [:cwiiis]]

If you switch the browser to Windows 8 mode and visit tweetdeck.twitter.com (of course, with an account setup and multiple panels configured), after scrolling some of the panels, they tend to stop re-rendering (they still respond to input, but the display doesn't change), and sometimes just disappear entirely.

This is likely an APZC-related layout bug.

Comment 1

[Matt Brubeck (:mbrubeck)]

Kats, could you take a look and see if this is indeed an APZC bug?  We'd like to know whether we should block release on this.

Comment 2

[Chris Lord [:cwiiis]]

Selfishly, I'd like this to block release because I use Tweetdeck all the time :) Slightly less selfish reasoning, Tweetdeck isn't a particularly complex or uncommon arrangement, structurally, and I'd be surprised if this bug didn't manifest quite commonly elsewhere (but perhaps on less critical content).

Comment 3

[Kartikaya Gupta (email:[e-mail])]

Chris, can you extract a standalone/simplified test case for this? I'd rather not have to create a tweetdeck account if I don't have to. Even if the test case isn't simplified but is a "File -> Save As..." snapshot of the page that demonstrates the problem that would help.

Comment 4

[Chris Lord [:cwiiis]]

Needinfo'ing myself for comment #3

Comment 5

[Kartikaya Gupta (email:[e-mail])]

I tried to reproduce this but was unable to. I signed in to tweetdeck using my twitter credentials and scrolled around in the four panels that show up by default (home/notifications/messages/activity) using touch scrolling. I saw some checkerboarding (i.e. flashes of white) but nothing else obviously wrong.

Chris, if you can repro getting a log with the APZC logging turned on (the defines at the top of APZCTreeManager.cpp and AsyncPanZoomController.cpp) would be helpful. Or you could debug it since you know the code well enough :)

Comment 6

[Chris Lord [:cwiiis]]

The bug only manifests after scrolling horizontally, so you may need to add more columns - I could still reproduce this a couple of days ago. The only difficulty is I don't have a windows machine handy to build right now, is there a way to enable APZC in Linux?

I'll see about getting a reduced test case. Also worth noting, a new bug has cropped up where you can't scroll horizontally if you initiate the scroll from one of the vertically scrolling columns.

Comment 7

[Jim Mathies [:jimm]]

Is this maybe a dupe of bug 956690?

Comment 8

[Chris Lord [:cwiiis]]

(In reply to Jim Mathies [:jimm] from comment #7)
> Is this maybe a dupe of bug 956690?

They could well be related, but I think if that is the cause, there are some very incorrect displayports being set...

Comment 9

[Chris Lord [:cwiiis]]

Clearing my needinfo and resolving as I'm pretty sure this is fixed now.