890361 - OS X default title bar appears when Firefox window is dragged into extended desktop screen

Status: ASSIGNED

(Core :: Widget: Cocoa, defect)

Description

[Jason Yeo[:jyeo]]

The titlebar for TB changes into the default OS X title bar when dragged into the extended screen when using an external monitor. See http://imgur.com/RWzUOs1.

It changes back to the normal title bar when dragged back to laptop's screen.

This happens only in TB25 that's built from http://hg.mozilla.org/mozilla-central/rev/85d75ed04851

This doesn't happen in my release version of TB17. Possibly a regression.

Comment 1

[Richard Marti (:Paenglab)]

I can't test this, I have no second monitor. Please can you try Firefox with the same revision? When this also happens with Firefox I suppose it's a toolkit issue.

Comment 2

[Jason Yeo[:jyeo]]

I can see that in firefox 25 too. See http://imgur.com/ktz8M0T.

The rev is http://hg.mozilla.org/mozilla-central/rev/dcbbfcdf7bb4

Comment 3

[Mark Banner (:standard8)]

Is this a retina -> normal screen thing? I think I've seen it in FF 24 as well.

Comment 4

[Jason Yeo[:jyeo]]

(In reply to Mark Banner (:standard8) from comment #3)
> Is this a retina -> normal screen thing?

Seems likely.

The regression is somewhere between

http://hg.mozilla.org/mozilla-central/rev/00b264c7cced

and

http://hg.mozilla.org/mozilla-central/rev/97aa3da59001

Comment 5

[Markus Stange [:mstange]]

I'm guessing I caused this in bug 871590.