Open Radar

 
Summary:
NSTableHeaderCell subclasses crash upon release when columns are removed if they have a String property that references another String like so: 
cell.property= "\(otherString)"

Other properties (including custom struct) seem to work.

Steps to Reproduce:
Create NSTableHeaderCell subclass "TableHeaderCell"

1. Add columns on button press:
2. Set a String in the view controller called `content` (or anything else)
3. Create new TableHeaderCell and set its custom property to "\(content)"
4. Create new column with its headerCell set to the instance from (3)
5. Add column to table view
6. Remove columns on button press
7. See (1)

Expected Results:
When pressing the button, the table columns should be created, then removed, then created, etc.

Actual Results:
The application crashes; with NSZombies enabled, it reports some totally unrelated object to be the cause

Version:
Version 7.3.1 (7D1014)
Mac OS 10.11.4 (15E65)

Notes:
The attached project archive contains a Swift and a ObjC version; only the Swift version crashes. Always some ivar release issue.

Configuration:
Crashes for Swift; works fine in Objective-C

Attachments:
'TableZombies.zip' was successfully uploaded.



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See Gist for the code:
https://gist.github.com/DivineDominion/c069c8d3d38d7cb880b5354524acf579