Hide palette group before immediate popup #1291

src/sugar/graphics/palettegroup.py

@@ -83,6 +83,9 @@ class Group(gobject.GObject):
                 palette.popdown(immediate=True)
 
     def _palette_popup_cb(self, palette):
+        for i in self._palettes:
+            if i != palette:
+                i.popdown(immediate=True)
         if not self._up:
             self.emit('popup')
             self._up = True

src/sugar/graphics/palettewindow.py

@@ -371,7 +371,8 @@ class PaletteWindow(gtk.Window):
             self.on_leave(event)
 
     def __show_cb(self, widget):
-        self._invoker.notify_popup()
+        if self._invoker is not None:
+            self._invoker.notify_popup()
 
         self._up = True
         self.emit('popup')