[PATCH] Create Patch for multiple files

Hi,

if multiple files are selected in a directory and these files have filenames
which start with a common prefix, then "Create Patch" fails.

Example in the sources of TSVN:

/command:createpatch /path:"C:
\Development\SVN\TortoiseSVN\src\TortoiseProc\LogDlg.cpp*C:
\Development\SVN\TortoiseSVN\src\TortoiseProc\LogDlg.h" /notempfile

This would currently determine
C:\Development\SVN\TortoiseSVN\src\TortoiseProc\LogDlg as the common
directory which is obviously wrong.

The attached patch fixes this. All tests in CTSVNPath pass, but please
review.

Should this be merged to 1.4.x?

Tobias

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