From d846b4bb6f9527cdd0a4e784dcd1e99fdc498e9f Mon Sep 17 00:00:00 2001
From: Victor Giers <mail@victorgiers.com>
Date: Sun, 5 Apr 2026 04:36:26 +0200
Subject: [PATCH] Enhance duplication logic with transform session handling

---
 src/app/App.tsx | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/src/app/App.tsx b/src/app/App.tsx
index 9e4321cf..4be49a4e 100644
--- a/src/app/App.tsx
+++ b/src/app/App.tsx
@@ -2811,13 +2811,40 @@ export function App({ store, initialStatusMessage }: AppProps) {
     try {
       store.executeCommand(createDuplicateSelectionCommand());
 
-      const duplicatedSelection = store.getState().selection;
+      const duplicatedState = store.getState();
+      const duplicatedSelection = duplicatedState.selection;
       const canGrabDuplicatedSelection =
         (duplicatedSelection.kind === "brushes" || duplicatedSelection.kind === "entities" || duplicatedSelection.kind === "modelInstances") &&
         duplicatedSelection.ids.length === 1;
 
       if (canGrabDuplicatedSelection) {
-        beginTransformOperation("translate", "keyboard");
+        const transformSourcePanelId = layoutMode === "quad" ? hoveredViewportPanelId ?? activePanelId : activePanelId;
+        const transformTargetResult = resolveTransformTarget(duplicatedState.document, duplicatedSelection, whiteboxSelectionMode);
+        const transformTarget = transformTargetResult.target;
+
+        if (transformTarget === null) {
+          setStatusMessage(transformTargetResult.message ?? "Duplicated selection, but could not start move transform.");
+          return true;
+        }
+
+        if (duplicatedState.activeViewportPanelId !== transformSourcePanelId) {
+          store.setActiveViewportPanel(transformSourcePanelId);
+        }
+
+        store.setTransformSession(
+          createTransformSession({
+            source: "keyboard",
+            sourcePanelId: transformSourcePanelId,
+            operation: "translate",
+            target: transformTarget
+          })
+        );
+
+        setStatusMessage(
+          `Move ${getTransformTargetLabel(transformTarget).toLowerCase()} in ${getViewportPanelLabel(
+            transformSourcePanelId
+          )}. Move the pointer, press X/Y/Z to constrain, click or press Enter to commit, Escape cancels.`
+        );
       } else {
         setStatusMessage("Duplicated selection.");
       }