Open Radar

 
Summary:
Note: I posted this as a Stack Overflow question, but got no answer: http://stackoverflow.com/questions/31488063/window-moves-when-clicking-control-in-title-region-with-titlebarappearstranspare

Submitted to DTS, was told it's a bug with no workaround.

I have a window that uses the Yosemite titlebarAppearsTransparent and titleVisibility = NSWindowTitleHidden properties to extend the content under the title region. It is also movableByWindowBackground.

This works fine, however if I have a control, e.g. NSPopUpButton, in the titlebar region, when I click and attempt to choose a menu item, the whole window moves (while the menu stays put).

Here's a demo:

http://i.imgur.com/ISlcnEV.gif

I've tried subclassing the NSPopUpButton and overriding mouseDownCanMoveWindow, but that doesn't help (it's called, but apparently ignored).

I created a demo project to reproduce the issue. It seems related to embedding the popup inside a NSSplitViewController. I can't avoid that, though, so I'm not sure what the solution might be.

Here's the demo project: http://www.dejal.com/files/2015/stackoverflow/hiddentitlesissuedemo.zip

Steps to Reproduce:
1. Run the demo project.
2. Click on either popup menu.
3. Try to select an item.

Expected Results:
The window doesn't move.

Actual Results:
The window will unexpectedly move.

Version:
Yosemite 10.10.4.