Or could one check the C code for "insert-file-contents"? Does it
mark the buffer modified if 0 bytes were read.
The code appears specifically to avoid marking the buffer modified
if the file has zero size. I just did a test, inserting an empty
file into a buffer this way. It did not mark the buffer modified
and did not lock the file.
Something we don't understand must be happening, and only you
are in a position to debug it.
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