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#326 TkpMeasureCharsInContext bugs in Tk Cocoa
For Chinese and other text where a UTF character is more than one byte, TkpMeasureCharsInContext returns "1" when called by the text widget to determine tag-under-mouse whether mouse is in fact over first or second character. (The attached script demonstates.) Tracing revealed this was because CTTypesetterSuggestClusterBreak() refuses to return a zero, even if the cluster break goes past the max. Added code to detect and correct this. While debugging a couple of other apparent errors were found and fixed.
Finally, some special code to ignore user-specified threshold and disable antialiasing for fixed-width fonts below 10-point was disabled. If this is going to be present, it should be exposed through a ::tk::mac variable so the user or application can turn it off, since this behavior is nonstandard.
Demonstrates the bug
Fixes the bug
Replaces earlier file (garbled by SF)
Replaces earlier file (garbled by SF)