extends SplitContainer

#############
# overrides #
#############
func add_child(child : Node, legible_unique_name := false) -> void:
	.add_child(child, legible_unique_name)
	
	child.connect("tree_exited", self, "_on_child_tree_exited")

#################
# private stuff #
#################
func __try_collapse() -> void:
	var count := get_child_count()
	if count == 0: # nothing left? I can go now
		self.queue_free()
		return
	elif count > 1: # more than one? I have to stay
		return
	
	# exactly one? replace me with them
	var child := get_child(0)
	remove_child(child)
	
	get_parent().add_child_below_node(self, child)
	GDBUIUtility.copy_size(child, self)
	self.queue_free()

###################
# signal handlers #
###################
func _on_child_tree_exited() -> void:
	if !get_tree():
		return
	
	yield(get_tree(), "idle_frame") # wait until child is actually gone
	__try_collapse()