From fb8da5f531b6d16715b6039f7e40043d6db5b856 Mon Sep 17 00:00:00 2001
From: Victor Giers <mail@victorgiers.com>
Date: Wed, 15 Apr 2026 14:41:58 +0200
Subject: [PATCH] Add support for 'brushes', 'modelInstances', and 'entities'
 in transform session comparison

---
 src/core/transform-session.ts | 57 +++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/src/core/transform-session.ts b/src/core/transform-session.ts
index f6172385..92a109fe 100644
--- a/src/core/transform-session.ts
+++ b/src/core/transform-session.ts
@@ -1032,6 +1032,26 @@ export function doesTransformSessionChangeTarget(
             session.target.initialGeometry
           ))
       );
+    case "brushes":
+      return (
+        session.preview.kind === "brushes" &&
+        (!areVec3Equal(session.preview.pivot, session.target.initialPivot) ||
+          session.preview.items.length !== session.target.items.length ||
+          session.preview.items.some((item, index) => {
+            const targetItem = session.target.items[index];
+
+            return (
+              item.brushId !== targetItem.brushId ||
+              !areVec3Equal(item.center, targetItem.initialCenter) ||
+              !areVec3Equal(
+                item.rotationDegrees,
+                targetItem.initialRotationDegrees
+              ) ||
+              !areVec3Equal(item.size, targetItem.initialSize) ||
+              !areBrushGeometriesEqual(item.geometry, targetItem.initialGeometry)
+            );
+          }))
+      );
     case "modelInstance":
       return (
         session.preview.kind === "modelInstance" &&
@@ -1045,6 +1065,25 @@ export function doesTransformSessionChangeTarget(
           ) ||
           !areVec3Equal(session.preview.scale, session.target.initialScale))
       );
+    case "modelInstances":
+      return (
+        session.preview.kind === "modelInstances" &&
+        (!areVec3Equal(session.preview.pivot, session.target.initialPivot) ||
+          session.preview.items.length !== session.target.items.length ||
+          session.preview.items.some((item, index) => {
+            const targetItem = session.target.items[index];
+
+            return (
+              item.modelInstanceId !== targetItem.modelInstanceId ||
+              !areVec3Equal(item.position, targetItem.initialPosition) ||
+              !areVec3Equal(
+                item.rotationDegrees,
+                targetItem.initialRotationDegrees
+              ) ||
+              !areVec3Equal(item.scale, targetItem.initialScale)
+            );
+          }))
+      );
     case "pathPoint":
       return (
         session.preview.kind === "pathPoint" &&
@@ -1065,6 +1104,24 @@ export function doesTransformSessionChangeTarget(
             session.target.initialRotation
           ))
       );
+    case "entities":
+      return (
+        session.preview.kind === "entities" &&
+        (!areVec3Equal(session.preview.pivot, session.target.initialPivot) ||
+          session.preview.items.length !== session.target.items.length ||
+          session.preview.items.some((item, index) => {
+            const targetItem = session.target.items[index];
+
+            return (
+              item.entityId !== targetItem.entityId ||
+              !areVec3Equal(item.position, targetItem.initialPosition) ||
+              !areEntityTransformRotationsEqual(
+                item.rotation,
+                targetItem.initialRotation
+              )
+            );
+          }))
+      );
   }
 }