Assistant: Set DIALOG type hint

gajim/gtk/assistant.py

@@ -49,6 +49,7 @@ def __init__(self,
         self.set_default_size(width, height)
         self.set_resizable(True)
         self.set_transient_for(transient_for)
+        self.set_type_hint(Gdk.WindowTypeHint.DIALOG)
 
         self._pages = {}
         self._buttons = {}