Creates a mark at position
mark_name is null, the mark is anonymous; otherwise, the mark can be retrieved by name using
[method@Gtk.TextBuffer.get_mark]. If a mark has left gravity, and text is inserted at the mark’s current location, the mark will be moved to
the left of the newly-inserted text. If the mark has right gravity (
left_gravity = false), the
mark will end up on the right of newly-inserted text. The standard left-to-right cursor is a mark with right gravity (when you type, the cursor
stays on the right side of the text you’re typing).
The caller of this function does not own a reference to the returned `GtkTextMark`, so you can ignore the return value if you like. Marks are owned by the buffer and go away when the buffer does.
Emits the [signal@Gtk.TextBuffer:
GtkTextBuffer:mark-set] signal as notification of the mark's initial placement.
name for mark
location to place mark
whether the mark has left gravity
the new `GtkTextMark` object