[processing] correctly handle filenames with long extension names in output file selector

fixes #10264

Author: volaya

python/plugins/processing/gui/OutputSelectionPanel.py

@@ -113,8 +113,8 @@ def selectFile(self):
             fileName = unicode(files[0])
             selectedFileFilter = unicode(fileDialog.selectedNameFilter())
             if not fileName.lower().endswith(
-                    tuple(re.findall("\*(\.[a-z]{1,5})", fileFilter))):
-                ext = re.search("\*(\.[a-z]{1,5})", selectedFileFilter)
+                    tuple(re.findall("\*(\.[a-z]{1,10})", fileFilter))):
+                ext = re.search("\*(\.[a-z]{1,10})", selectedFileFilter)
                 if ext:
                     fileName += ext.group(1)
             self.leText.setText(fileName)