gitk: Work around leftover temporary save file
If a file exists and is hidden on Windows the Tcl open command will fail as the attributes provided in the CREAT call fail to match those of the existing file. Forcing removal of the temporary file before we begin solves any problems caused by previous failures to save the application settings. An alternative would be to remove the hidden attribute before calling 'open'. Signed-off-by: NPat Thoyts <patthoyts@users.sourceforge.net> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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