In code based largely on Apple's SourceView, I am drawing by IconAndTextCell
and getting a crash...

Anyone seen this and know what it might be?

I have added code to draw a badge which I am updating frequently - if I only
call it once, it works ok... But if it is called rapidly I get:

Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
0   libobjc.A.dylib                   0x00007fff818ab120 objc_msgSend + 44
1   com.apple.CoreFoundation          0x00007fff867ac246
_CFAutoreleasePoolPop + 230
2   com.apple.AppKit                  0x00007fff81a69d3d -[NSTableView
drawRow:clipRect:] + 1343
3   com.apple.AppKit                  0x00007fff81a695cb -[NSTableView
drawRowIndexes:clipRect:] + 369
4   com.apple.AppKit                  0x00007fff81a6944c -[NSOutlineView
drawRowIndexes:clipRect:] + 131
5   com.apple.AppKit                  0x00007fff81a67f78 -[NSTableView
drawRect:] + 1302
6   com.apple.AppKit                  0x00007fff81a5e05e -[NSView
_drawRect:clip:] + 3566
7   com.apple.AppKit                  0x00007fff81a5b834 -[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRect
ForView:topView:] + 2112
8   com.apple.AppKit                  0x00007fff81a5c1bf -[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRect
ForView:topView:] + 4555
9   com.apple.AppKit                  0x00007fff81a5c1bf -[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRect
ForView:topView:] + 4555
10  com.apple.AppKit                  0x00007fff81a5c1bf -[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRect
ForView:topView:] + 4555
11  com.apple.AppKit                  0x00007fff81a5c1bf -[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRect
ForView:topView:] + 4555
12  com.apple.AppKit                  0x00007fff81a5ae17 -[NSThemeFrame
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRect
ForView:topView:] + 254
13  com.apple.AppKit                  0x00007fff81a576bf -[NSView
_displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 2683
14  com.apple.AppKit                  0x00007fff819d0f37 -[NSView
displayIfNeeded] + 969


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