Emit the ::query-data signal. This function is called to query for data
just before rendering a cell. This is called from the GtkSourceGutter.
Implementations can override the default signal handler or can connect
a signal handler externally to the ::query-data signal.
Emit the ::query-data signal. This function is called to query for data just before rendering a cell. This is called from the GtkSourceGutter. Implementations can override the default signal handler or can connect a signal handler externally to the ::query-data signal.