create_source_mark

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..

Parameters:

this	a Buffer.
name	the name of the mark, or null.
category	a string defining the mark category.
where	location to place the mark.

Returns:

a new [class@Mark], owned by the buffer.