Backport: Fix for #86

This partially reverts fix for #62
which used not detailed enought test and drew partially wrong conclusions.

workbench/libs/muimaster/classes/area.c

@@ -1957,7 +1957,7 @@ static IPTR event_button(Class *cl, Object *obj,
                     (IPTR) &data->mad_ehn);
             }
             handle_press(cl, obj);
-            return 0;
+            return MUI_EventHandlerRC_Eat;
         }
         break;