Location of disclosure triangle on NSOutlineView moves as column is narrowed

Originator:oliver
Number:rdar://14242232 Date Originated:24-Jun-2013 10:41 AM
Status:Open Resolved:
Product:OS X Product Version:10.8.4/12E55
Classification:Serious Bug Reproducible:Always
 
Summary:
When resizing the 1st column of an NSOutlineView the disclosure triangles march right across the screen when the column is narrower than necessary to show the expanded item's disclosure triangle.

Steps to Reproduce:
See attached sample project.

Expected Results:
That the layout of the the disclosure triangles is not effected by the width of the column.

Actual Results:
Craziness.

Regression:
Probably, I've not tested on previous versions of AppKit.

Attachments:
https://dl.dropboxusercontent.com/u/1632081/OpenRadar/NSOutlineViewBroken.mov
https://dl.dropboxusercontent.com/u/1632081/OpenRadar/OutlineViewTest.zip

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