void gtk_text_buffer_place_cursor ( GtkTextBuffer* buffer, const GtkTextIter* where )
This function moves the “insert” and “selection_bound” marks simultaneously.
If you move them to the same place in two steps with
gtk_text_buffer_move_mark(), you will temporarily select a
region in between their old and new locations, which can be pretty
inefficient since the temporarily-selected region will force stuff
to be recalculated. This function moves them as a unit, which can
Where to put the cursor.
The data is owned by the caller of the function.