Don't update modifiers when terrain is moved

modifiers/godot/voxel_modifier_gd.cpp

@@ -133,15 +133,15 @@ void VoxelModifier::_notification(int p_what) {
 
 				const AABB prev_aabb = modifier->get_aabb();
 				Transform3D terrain_local = _volume->get_global_transform().affine_inverse() * get_global_transform();
+				// If the terrain moved, the modifiers do not need to be updated.
+				if (terrain_local == modifier->get_transform()) {
+					break;
+				}
+				WARN_PRINT("MODIFIER WAS UPDATED");
 				modifier->set_transform(terrain_local);
 				const AABB aabb = modifier->get_aabb();
 				post_edit_modifier(*_volume, prev_aabb);
 				post_edit_modifier(*_volume, aabb);
-
-				// TODO Handle nesting properly, though it's a pain in the ass
-				// When the terrain is moved, the local transform of modifiers technically changes too.
-				// However it did not change relative to the terrain. But because we don't have a way to check that,
-				// all modifiers will trigger updates at the same time...
 			}
 		} break;
 	}