fixed bug with directories with trailing (back)slashes in wxPathExists

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_2_BRANCH@7718 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/filefn.cpp

@@ -1160,11 +1160,18 @@ bool wxDirExists(const wxString& dir)
 // does the path exists? (may have or not '/' or '\\' at the end)
 bool wxPathExists(const wxChar *pszPathName)
 {
-  /* Windows API returns -1 from stat for "c:\dir\" if "c:\dir" exists
-   * OTOH, we should change "d:" to "d:\" and leave "\" as is. */
+    // Windows fails to find directory named "c:\dir\" even if "c:\dir" exists,
+    // so remove all trailing backslashes from the path - but don't do this for
+    // the pathes "d:\" (which are different from "d:") nor for just "\"
     wxString strPath(pszPathName);
-  if ( wxEndsWithPathSeparator(pszPathName) && pszPathName[1] != wxT('\0') && pszPathName[1] != wxT(':') )
-    strPath.Last() = wxT('\0');
+    while ( wxEndsWithPathSeparator(strPath) )
+    {
+        size_t len = strPath.length();
+        if ( len == 1 || strPath[len - 1] == _T(':') )
+            break;
+
+        strPath.Truncate(len - 1);
+    }
 
     wxStructStat st;