Removes @iter from @tree_store. After being removed, @iter is set to the next valid row at that level, or invalidated if it previously pointed to the last one.
A valid #GtkTreeIter
%TRUE if @iter is still valid, %FALSE if not.
See Implementation
Removes @iter from @tree_store. After being removed, @iter is set to the next valid row at that level, or invalidated if it previously pointed to the last one.