Unselects a marker in this layer.
This works even if #ShumateMarkerLayer:selection-mode is %GTK_SELECTION_BROWSE. Browse mode only prevents user interaction, not the program, from unselecting a marker.
a #ShumateMarker that is a child of @self
See Implementation
Unselects a marker in this layer.
This works even if #ShumateMarkerLayer:selection-mode is %GTK_SELECTION_BROWSE. Browse mode only prevents user interaction, not the program, from unselecting a marker.