Fix xform_inv of Plane, intermediate results were ignored
Fix xform_inv of Plane, intermediate results were ignored

(cherry picked from commit 4cb070e5906bfe2cb4b949f4ec26478b31b8b219)

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot