Bug 661991 - follow up, make sure and clear file lists before calling file picker's Show. r=bbondy.

widget/src/windows/nsFilePicker.cpp

@@ -813,9 +813,6 @@ nsFilePicker::ShowXPFilePicker(const nsString& aInitialDir)
     return true;
   }
 
-  // Clear previous file selection list
-  mFiles.Clear();
-
   // Set user-selected location of file or directory.  From msdn's "Open and
   // Save As Dialog Boxes" section:
   // If you specify OFN_EXPLORER, the directory and file name strings are NULL
@@ -1040,7 +1037,9 @@ nsFilePicker::ShowW(PRInt16 *aReturnVal)
     initialDir = mLastUsedUnicodeDirectory;
   }
 
+  // Clear previous file selections
   mUnicodeFile.Truncate();
+  mFiles.Clear();
 
   bool result = false;
    if (mMode == modeGetFolder) {