[pull] main from python:main - #1473
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…6943) Reserve one byte in PyBytesWriter used as a canary byte: set it to a special value. PyBytesWriter_Finish() checks if the canary byte has been overriden to detect a buffer overflow. Add tests for this feature. Update buffer overflow check in fcntl: allocate extra guard bytes in the writer and then truncate these bytes.
Don't modify directly the writer size, call PyBytesWriter_GrowAndUpdatePointer() instead.
Check the canary byte in all PyBytesWriter methods, not only in PyBytesWriter_Finish(). Add a discard() method to the _testcapi wrapper.
On some systems a font reports a zero width for the '0' character (seen with a broken font on openSUSE). EditorWindow.set_width() divides the Text widget's pixel width by that value, so the ZeroDivisionError prevented IDLE from starting at all. set_width() now falls back to the configured width when the measured width is zero. self.width is consumed by the === RESTART === separator in the shell and by the squeezer's line wrapping. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Replace soft deprecated _PyBytes_Resize() with PyBytesWriter.
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