Hello Martin,

Thank you for your response.

> The text container isn't really responsible for that. It's job is to merely
> define the geometric space available for text. I would expect you'll find it
> easier to override NSTypesetter's
> "willSetLineFragmentRect:forGlyphRange:etc:" method.

I will check this out.

> NSLayoutManager is touchy about changing NSTextContainer geometry during
> layout, but I would expect it to be safe to do so in response to that
> notification. Are you perhaps altering the contents of your NSTextStorage in
> response to layout events/notifications? Can you post the full stack
> backtrace for the exception?

#0      0x92811e17 in objc_exception_throw
#1      0x9071bf2b in +[NSException raise:format:arguments:]
#2      0x9071bf6a in +[NSException raise:format:]
#3      0x934598cc in _NSBlockNumberForIndex
#4      0x93462baf in -[NSLayoutManager
textContainerForGlyphAtIndex:effectiveRange:]
#5      0x934629c8 in -[NSLayoutManager glyphRangeForTextContainer:]
#6      0x0026d4ab in -[MyTestController textDidChange_private:] at
MyTestController.m:2178
#7      0x0026d08d in -[MyTestController TT_TextStorageContentChanged:] at
MyTestController.m:2017

This raises after changing text view container size
([__viewTextContainer setContainerSize:NSMakeSize(MAX_SIZE,
MAX_SIZE)];), when calling [__viewLayoutManager
glyphRangeForTextContainer:__viewTextContainer];. This
(glyphRangeForTextContainer  call) is required to use NSRect __realRec
= [__viewLayoutManager usedRectForTextContainer:__viewTextContainer];

Rimas M.
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