A `GtkSourceMark` marks a position in the text where you want to display additional info. It is based on [[email protected]] and thus is
still valid after the text has changed though its position may change.
`GtkSourceMark`s are organized in categories which you have to set when you create the mark. Each category can have a priority, a pixbuf
and other associated attributes. See [[email protected]_mark_attributes]. The pixbuf will be displayed in the margin at the line where the
mark residents if the [property@View:show-line-marks] property is set to true. If there are multiple
marks in the same line, the pixbufs will be drawn on top of each other. The mark with the highest priority will be drawn on top.