Parses a file containing a [UI definition][XML-UI] and merges it with the current contents of manager.
the name of the file to parse
The merge id for the merged UI. The merge id can be used to unmerge the UI with gtk.uimanager.UIManager.removeUi. If an error occurred, the return value is 0.
ErrorWrap
Parses a file containing a [UI definition][XML-UI] and merges it with the current contents of manager.