Simplify Control internal transform calculation

scene/gui/control.cpp

@@ -682,12 +682,10 @@ Size2 Control::get_parent_area_size() const {
 // Positioning and sizing.
 
 Transform2D Control::_get_internal_transform() const {
-	Transform2D rot_scale;
-	rot_scale.set_rotation_and_scale(data.rotation, data.scale);
-	Transform2D offset;
-	offset.set_origin(-data.pivot_offset);
-
-	return offset.affine_inverse() * (rot_scale * offset);
+	// T(pivot_offset) * R(rotation) * S(scale) * T(-pivot_offset)
+	Transform2D xform(data.rotation, data.scale, 0.0f, data.pivot_offset);
+	xform.translate_local(-data.pivot_offset);
+	return xform;
 }
 
 void Control::_update_canvas_item_transform() {