Selects a marker in this layer.
If #ShumateMarkerLayer:selection-mode is %GTK_SELECTION_SINGLE or %GTK_SELECTION_BROWSE, all other markers will be unselected. If the mode is %GTK_SELECTION_NONE or @marker is not selectable, nothing will happen.
a #ShumateMarker that is a child of @self
%TRUE if the marker is now selected, otherwise %FALSE
See Implementation
Selects a marker in this layer.
If #ShumateMarkerLayer:selection-mode is %GTK_SELECTION_SINGLE or %GTK_SELECTION_BROWSE, all other markers will be unselected. If the mode is %GTK_SELECTION_NONE or @marker is not selectable, nothing will happen.