bug#310: Save As removes original file

bug#310: Save As removes original file

[David Reitter]

Package: aquamacs
Version: CVS

"Save Buffer As..." sometimes appears to *move* the visited file to a  
new
location with a new filename -- removing the original file -- instead of
simply creating a new file.  This is out of line with standard OS X  
"save
as" behavior.  M-x write-file (called by `mac-key-save-file-as') does  
the
same thing.

Test cases:

Open an existing file in Aquamacs
Shift-Apple-S and give a new filename.
Result: old file is missing.

Open an existing file in Aquamacs
edit buffer.
Shift-Apple-S and give a new filename.
Result: old file is missing.

Open an existing file in Aquamacs
edit buffer.
Save with Apple-S.
Shift-Apple-S and give a new filename.
Result: old file is missing.

Open an existing file in Aquamacs
edit buffer.
Shift-Apple-S and give a new filename.  (Old file goes missing)
edit buffer, or don't.
Shift-Apple-S (again) and give a yet different filename.
Result: previous file is NOT missing

Can others reproduce?  Why the different behaviors here?

--Nathaniel
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