Godot script leak

tool
extends EditorPlugin

const BUTTON_START_ID = 0
const BUTTON_WIRE_ID = 1
const BUTTON_CLOUD_ID = 2
const BUTTON_HELP_ID = 4

var meshInstance #edited meshInstance
var editedMaterial = preload("res://addons/Line Tool/editMat.tres") #material for vertex color preview (unshaded)
var toolsMenu = preload("res://addons/Line Tool/toolsMenu.tscn").instance()
var helpDialog = preload("res://addons/Line Tool/helpDialog.tscn").instance()
var alertPopup = AcceptDialog.new()
var edgeSelector1 = -1
var edgeSelector2 = -1
var selectorColor = Color(1.0, 0.0, 0.0)

func _enter_tree():
	toolsMenu.hide()
	toolsMenu.get_popup().connect("item_pressed", self, "menuItemPressed")
	get_base_control().add_child(alertPopup)
	get_base_control().add_child(helpDialog)
	add_control_to_container(1, toolsMenu)

func _exit_tree():
	toolsMenu.get_popup().disconnect("item_pressed", self, "menuItemPressed")
	toolsMenu.free()
	get_base_control().remove_child(alertPopup)
	get_base_control().remove_child(helpDialog)
	alertPopup.free()
	helpDialog.free()

func forward_spatial_input_event(camera, event):
	if (event.type == InputEvent.MOUSE_BUTTON):
		if (event.button_index == BUTTON_LEFT and event.pressed):
			if (meshInstance.has_meta("orgMesh")):
				var meshTool = MeshDataTool.new()
				meshTool.create_from_surface(meshInstance.get_meta("orgMesh"), 0)
				var index
				var oldDistance = 400000
				for i in range(meshTool.get_vertex_count()):
					var unprVer = camera.unproject_position(meshTool.get_vertex(i))
					var distance = unprVer.distance_to(event.pos)
					if (distance < oldDistance):
						oldDistance = distance
						index = i
				if (event.alt):
					edgeSelector2 = index
				else:
					edgeSelector1 = index
				meshTool.set_vertex_color(index, selectorColor)
				print("sel1: ", edgeSelector1, " - ", "sel2: ", edgeSelector2)

				#possible memory leak?
				var newWireMesh = generateWireframeMesh(meshTool)
				meshInstance.get_meta("orgMesh").surface_remove(0)
				meshTool.commit_to_surface(meshInstance.get_meta("orgMesh"))
				#if you comment out these two lines, no memory is leaking
				meshInstance.get_mesh().surface_remove(0)
				meshInstance.set_mesh(newWireMesh)
	elif (event.type == InputEvent.KEY):
		pass #check delete key

func startEditing():
	if (!meshInstance.has_meta("orgMesh")):
		var meshTool = MeshDataTool.new()
		meshTool.create_from_surface(meshInstance.get_mesh(), 0)
		var previewMesh = generateWireframeMesh(meshTool)
		meshInstance.set_meta("orgMesh", meshInstance.get_mesh())
		meshInstance.set_mesh(previewMesh)
		meshInstance.set_material_override(editedMaterial)

func generateWireframeMesh(meshTool):
	var surfaceTool = SurfaceTool.new()
	surfaceTool.begin(Mesh.PRIMITIVE_LINES)

	for i in range(meshTool.get_edge_count()):

		if (meshTool.get_edge_vertex(i, 0) == edgeSelector1 or meshTool.get_edge_vertex(i, 0) == edgeSelector2):
			surfaceTool.add_color(selectorColor.inverted())
		else:
			surfaceTool.add_color(meshTool.get_vertex_color(meshTool.get_edge_vertex(i, 0)))
		surfaceTool.add_normal(meshTool.get_vertex_normal(meshTool.get_edge_vertex(i, 0)))
		surfaceTool.add_vertex(meshTool.get_vertex(meshTool.get_edge_vertex(i, 0)))

		if (meshTool.get_edge_vertex(i, 1) == edgeSelector1 or meshTool.get_edge_vertex(i, 1) == edgeSelector2):
			surfaceTool.add_color(selectorColor.inverted())
		else:
			surfaceTool.add_color(meshTool.get_vertex_color(meshTool.get_edge_vertex(i, 1)))
		surfaceTool.add_normal(meshTool.get_vertex_normal(meshTool.get_edge_vertex(i, 1)))
		surfaceTool.add_vertex(meshTool.get_vertex(meshTool.get_edge_vertex(i, 1)))

	var wireMesh = surfaceTool.commit()
	return wireMesh

func commitWireframe():
	if (meshInstance.has_meta("orgMesh")):
		##not implemented
		pass

func menuItemPressed(ID):
	if (ID == BUTTON_WIRE_ID):
		pass
	elif (ID == BUTTON_CLOUD_ID):
		pass
	elif (ID == BUTTON_START_ID):
		startEditing()
	elif (ID == BUTTON_HELP_ID):
		helpDialog.popup_centered()

func showWarning(message):
	alertPopup.set_text(message)
	alertPopup.popup_centered()

func handles(object):
	if (object.is_type("MeshInstance")):
		return true
	else:
		return false

func edit(object):
	meshInstance = object
	print("newSelection")
	edgeSelector1 = -1
	edgeSelector2 = -1

func clear():
	meshInstance = null

func make_visible(visible):
	if (visible == true):
		toolsMenu.show()
	else:
		toolsMenu.hide()