Gets the bounds for the completion, which is the beginning of the current word (taking break characters into account) to the current insertion cursor.
If begin is non-null, it will be set to the start position of the current word being completed.
If end is non-null, it will be set to the insertion cursor for the current word being completed.
a #GtkTextIter
true if the marks are still valid and begin or end was set.
Gets the bounds for the completion, which is the beginning of the current word (taking break characters into account) to the current insertion cursor.
If begin is non-null, it will be set to the start position of the current word being completed.
If end is non-null, it will be set to the insertion cursor for the current word being completed.