createSourceMark
Creates a source mark in the buffer of category category.
A source mark is a class@Gtk.TextMark but organized into categories. Depending on the category a pixbuf can be specified that will be displayed along the line of the mark.
Like a class@Gtk.TextMark, a class@Mark can be anonymous if the passed name is null. Also, the buffer owns the marks so you shouldn't unreference it.
Marks always have left gravity and are moved to the beginning of the line when the user deletes the line they were in.
Typical uses for a source mark are bookmarks, breakpoints, current executing instruction indication in a source file, etc..
Return
a new class@Mark, owned by the buffer.
Parameters
the name of the mark, or null.
a string defining the mark category.
location to place the mark.