A save writes a temporary file beside the document and renames it over
it. Some network shares refuse one of those steps although the document
itself can be written. The save now falls back, without giving up what
the rename is for:
- the temporary file can't be created beside the document: it is made
in the system's temporary folder (for its owner only);
- the rename is refused: the content, whole and flushed in the
temporary file, is copied into the document itself;
- when that copy fails, the temporary file stays and the error names
it; when the document can't be opened for writing, it is untouched
and the first error is returned;
- permissions that can't be copied to the temporary file (SMB, FAT) no
longer fail the save.
A folder that isn't there and a full volume fail as before.
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