clicking a selected region will now deselect it

sdtd_world/region_label_collection.py

@@ -23,11 +23,16 @@ class RegionLabelCollection(QGridLayout):
 
     def set_selected(self, region_label=None):
         for index, label in self.label_collection.items():
-            label.is_selected = False
-            label.update_graphics_effect()
+            if region_label is not label:
+                label.is_selected = False
+                label.update_graphics_effect()
 
         if region_label is not None:
-            region_label.is_selected = True
+            if region_label.is_selected is True:
+                self.set_selected()
+            else:
+                region_label.is_selected = True
+
             region_label.update_graphics_effect()
 
     def toggle_marked(self, region_label=None):