From this I assume that Xcode keeps multiple copies of source files in
memory, rather than sharing the same data between editors, and what
was
sent to the compiler was the wrong copy.
The compiler driver (gcc) is passed file paths, not the contents of
the files.
That would be consistent with the build failing, as the end result was
as if the (older) source in the embedded editor had been sent to the
compiler and the (newly saved) source in the stand-alone editor had
not.
It would seem as though the save hadn't happened by this point.
I have lost work a couple of times to this, by making changes and
saving
from the embedded editor (which then overwrites the file with the old
copy of the source) so I don't think it's that time sensitive (other
than the two editors getting out of sync).
I could see them getting out of sync and not realizing that one of
them was dirty so it doesn't actually save. But obviously, I don't
know for sure.
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