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Update FvwmAuto.c#103

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hundertzwei wants to merge 1 commit intofvwmorg:masterfrom
hundertzwei:hundertzwei-FvwmAuto_offbytwo
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Update FvwmAuto.c#103
hundertzwei wants to merge 1 commit intofvwmorg:masterfrom
hundertzwei:hundertzwei-FvwmAuto_offbytwo

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from gcc-12 up, this modul will terminated with *** buffer overflow detected ***. That's because the sprintf further down will copy not only the string, but also a linefeed and a terminating null-byte at the end of the buffer. This is two times off by one.

from gcc-12 up, this modul will terminated with *** buffer overflow detected ***.
That's because the sprintf further down will copy not only the string, but also a linefeed and a terminating null-byte at the end of the buffer.
This is two times off by one.
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