941087 - Native menus size incorrectly on OSX when switching resolutions from non-retina to retina

Status: NEW

(Core :: Widget: Cocoa, defect)

Description

[Lonnen :lonnen]

Attachment: screen cap of the problem

Steps to reproduce:

1. open a window on an external monitor (non-retina)
2. disconnect from the monitor so that all windows go back onto a retina display
3. trigger a native widget (awesomebar url suggestions, right click menu) and notice that the elements in the widget are sized for the non-retina display

When opening a window on the retina display after disconnecting things appear at the expected size.  Tearing off a tab from a non-retina opened window on a retina display fixes it. It seems to be a property of the window.

Comment 1

[Lonnen :lonnen]

Attachment: same tab after tearing it off to its own window on a retina screen

Comment 2

[:Gijs (he/him)]

Markus, do you know how fixable this is? :-)

Comment 3

[Markus Stange [:mstange]]

Definitely fixable, but I don't know how easily.

Timothy, any ideas before I start debugging?

Comment 4

[Timothy Nikkel (:tnikkel)]

nsCocoaWindow/nsChildView::BackingScaleFactor just return the cached backing scale factor if we have one, so maybe it's not getting updated in this case?

Check the values here http://mxr.mozilla.org/mozilla-central/source/view/src/nsView.cpp#342 to make sure they make sense?

jfkthame might have something come to mind quickly, he dealt with a lot of bugs like this.