Bug 1750533

Summary:	firefox tab contents are updated with large delay after a tab switch
Product:	[Fedora] Fedora	Reporter:	Zbigniew Jędrzejewski-Szmek <zbyszek>
Component:	firefox	Assignee:	Martin Stransky <stransky>
Status:	CLOSED RAWHIDE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	31	CC:	0xalen+redhat, anto.trande, dimitris.on.linux, dueno, gecko-bugs-nobody, jhorak, john.j5live, kengert, lsatenstein, pjasicek, rhughes, rstrode, sandmann, stransky, tadej.j
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Last Closed:	2019-09-19 12:34:03 UTC	Type:	Bug
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Bug Blocks:	1054334

Description Zbigniew Jędrzejewski-Szmek 2019-09-09 20:06:10 UTC

Description of problem:
With new firefox (on wayland), after I switch a tab, the "tab bar" at the top indicates that a switched happened (the new tab is highlighted), but contents of switched-from tab are visible for some time. How long seems to depend on the contents. In some cases the whole contents are replaced, but I have seen cases where rectangles are replaced with the new content. After a few seconds only new contents are shown.

This is problematic, because (in the cases where no new content is shown, just the contents of the switched-from tab), it is very easy to be confused, and try to switch tabs further. The partial case, when new contents of the switched-from and swithed-to tabs are mixed, is paradoxically better — it is ugly, but not confusing.

Hardware and software: 
VGA compatible controller: Intel Corporation Skylake GT2 [HD Graphics 520] (rev 07)
firefox-69.0-2.fc31.x86_64
kernel-core-5.3.0-0.rc6.git0.1.fc31.x86_64

This certainly didn't happen with firefox-wayland-67, and the older kernel. Not sure who is the culprit.

Comment 1 Zbigniew Jędrzejewski-Szmek 2019-09-09 20:07:59 UTC

This also happens with kernel-core-5.2.9-200.fc30.x86_64, and didn't before. So the new firefox version seems relevant.
(I'm running on wayland and using firefox-wayland).

Comment 2 Martin Stransky 2019-09-10 09:00:50 UTC

I think it's https://bugzilla.mozilla.org/show_bug.cgi?id=1579794

Comment 3 Martin Stransky 2019-09-10 10:20:09 UTC

Let's backport that to FF69 at Fedora.

Comment 4 Zbigniew Jędrzejewski-Szmek 2019-09-11 11:27:58 UTC

>  https://bugzilla.mozilla.org/show_bug.cgi?id=1579794

Yeah, sounds reasonable. Having video in one of the tabs seems to make this much more likely.
(But it also happens with other tabs...).

Comment 5 Martin Stransky 2019-09-11 12:46:31 UTC

It's https://bugzilla.mozilla.org/show_bug.cgi?id=1580152 and it's actually a different bug. I'll backport it to 69.0-5.

Comment 6 Martin Stransky 2019-09-11 19:26:04 UTC

New builds are here - https://koji.fedoraproject.org/koji/taskinfo?taskID=37604373

Comment 7 Martin Stransky 2019-09-12 05:39:22 UTC

*** Bug 1751238 has been marked as a duplicate of this bug. ***

Comment 8 Martin Stransky 2019-09-12 05:43:11 UTC

*** Bug 1751372 has been marked as a duplicate of this bug. ***

Comment 9 Fedora Update System 2019-09-12 05:46:31 UTC

FEDORA-2019-7666428f3c has been submitted as an update to Fedora 30. https://bodhi.fedoraproject.org/updates/FEDORA-2019-7666428f3c

Comment 10 Martin Stransky 2019-09-12 06:30:02 UTC

I revoked the update as the fix seems to be only partial.

Comment 11 Zbigniew Jędrzejewski-Szmek 2019-09-13 16:09:01 UTC

(In reply to Martin Stransky from comment #6)
> New builds are here -
> https://koji.fedoraproject.org/koji/taskinfo?taskID=37604373

Yeah, I can confirm that this fixes the issue, but only partially. It's clearly better though.

Comment 12 Martin Stransky 2019-09-16 08:09:43 UTC

The final fix is at https://bugzilla.mozilla.org/show_bug.cgi?id=1580152, I'll back port it to Fedora when it hits mozilla nightly.

Comment 13 Martin Stransky 2019-09-17 11:01:06 UTC

We also need to take https://bugzilla.mozilla.org/show_bug.cgi?id=1581748

Comment 14 Martin Stransky 2019-09-19 12:33:00 UTC

Should be fixed by firefox-69.0.1-1 and later.

Comment 15 Martin Stransky 2019-09-19 12:33:43 UTC

btw. the builds are there - https://koji.fedoraproject.org/koji/buildinfo?buildID=1379884

Comment 16 Martin Stransky 2019-09-19 12:35:28 UTC

I'll submit firefox-69.0.1-2 as an update when it finishes.