Fix hiding controls not calling EditorUnfocus

addons/terrain-editing/terrain_editing_plugin.gd

@@ -15,6 +15,9 @@ func _make_visible(visible: bool) -> void:
 		add_control_to_container(CONTAINER, controls)
 	elif controls and controls.get_parent():
 		remove_control_from_container(CONTAINER, controls)
+		if current_terrain:
+			current_terrain.EditorUnfocus()
+			current_terrain = null
 
 func _forward_3d_gui_input(camera: Camera3D, event: InputEvent) -> int:
 	var position := Vector3.ZERO