show_column(): minor simplification using set.discard() instead of set.remove()

Author: zas

picard/ui/itemviews/__init__.py

@@ -287,8 +287,8 @@ def show_column(self, column, show):
         self.parent().setColumnHidden(column, not show)
         if show:
             self._visible_columns.add(column)
-        elif column in self._visible_columns:
-            self._visible_columns.remove(column)
+        else:
+            self._visible_columns.discard(column)
 
     def contextMenuEvent(self, event):
         menu = QtWidgets.QMenu(self)