TextBuffer.addOnBeginUserAction

The ::begin-user-action signal is emitted at the beginning of a single user-visible operation on a GtkTextBuffer. gtk_text_buffer_begin_user_action(), gtk_text_buffer_insert_interactive(), gtk_text_buffer_insert_range_interactive(), gtk_text_buffer_delete_interactive(), gtk_text_buffer_backspace(), gtk_text_buffer_delete_selection().