1167670 - Layout is broken when unplugging an external monitor

Status: RESOLVED DUPLICATE of bug 1154125

(Core :: Layout, defect)

Description

[Kumar McMillan [:kumar]]

Attachment: expected-layout-when-unplugged.png

On twitter.com, the layout is broken when I unplug an external monitor from my laptop. 

STR:
- plug in an external monitor to a laptop
- make the external monitor your primary window
- load twitter.com and make sure the window is on the external monitor
- unplug the monitor so that all windows move to the laptop window

Expected: I've attached an expected screenshot which I get when I refresh the URL after unplugging.

Application Basics
------------------

Name: Firefox
Version: 40.0a2
Build ID: 20150519004002
Update Channel: aurora
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:40.0) Gecko/20100101 Firefox/40.0
Multiprocess Windows: 0/9 (default: false)

Comment 1

[Kumar McMillan [:kumar]]

Attachment: actual-layout-when-unplugged.png

Comment 2

[Kumar McMillan [:kumar]]

Just to be clear, this happens on other sites, not just Twitter. I'll attach some screenshots.

Comment 3

[Kumar McMillan [:kumar]]

Attachment: gh-expected-layout-when-unplugged.png

Comment 4

[Kumar McMillan [:kumar]]

Attachment: gh-actual-layout-when-unplugged.png

Comment 5

[Bill Walker [:bwalker] [@wfwalker]]

I see the same symptoms in Firefox 38 and 41 on Mac OS X 10.10.4. My external monitor is old and is not Retina.

Comment 6

[Alex Davis [:adavis]]

+1

Comment 7

[Alex Davis [:adavis]]

Attachment: Here is an example of a broken content layout after unplugging a secondary display.

Comment 8

[Alex Davis [:adavis]]

Attachment: Here is another example of a broken content layout after unplugging a secondary display.

Comment 9

[Valerie]

+1

Comment 10

[Holly Habstritt Gaal [:Habber]]

+1 !

Comment 11

[Alex Davis [:adavis]]

MattN, who could we escalate this to?

Comment 12

[Matthew N. [:MattN]]

BenWa/Milan, this seems vaguely similar to bug 1189565, is someone working on this? Many Mozillians in offices are affected by this when leaving their desks for meetings.

Comment 13

[Milan Sreckovic [:milan] (needinfo for best results)]

I believe Markus was looking at this a bit, but I could be wrong.  It is also perhaps a good way to avoid meetings? :)

Comment 14

[Benoit Girard (:BenWa)]

Is it APZ only? Can you still get the bug if you disable it?

Comment 15

[Matthew N. [:MattN]]

(In reply to Benoit Girard (:BenWa) from comment #14)
> Is it APZ only? 
No.

> Can you still get the bug if you disable it?

Yes. I have this in about:support as I disabled APZ for another bug the other day.

> Asynchronous Pan/Zoom:	none

Comment 16

[:Gijs (he/him)]

Tentatively moving this to Layout. Might need to be widget or gfx or something else, but it's definitely not "Fx::General".

Comment 17

[Jonathan Kew [:jfkthame]]

Does this still occur in latest Nightly? I'm guessing bug 1154125 may have fixed the issues here.

Comment 18

[Kumar McMillan [:kumar]]

I could not reproduce it following the original steps on today's Nightly.

Comment 19

[Jonathan Kew [:jfkthame]]

OK, I'm reasonably sure this is another manifestation of bug 1154125 -- dup'ing.

Comment 20

[Alex Davis [:adavis]]

I just wanted to say THANK YOU! You made my week. I have tried to replicate the bug after updating to latest nightly. I was unable to reproduce it. It seems to be resolved. (doing the happy dance)