From 14e401c9fac406096d05b6986d466df2f6494401 Mon Sep 17 00:00:00 2001
From: Victor Giers <mail@victorgiers.com>
Date: Sun, 5 Apr 2026 04:36:33 +0200
Subject: [PATCH] Enhance selection duplication handling in App.js

---
 src/app/App.js | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/src/app/App.js b/src/app/App.js
index b99878a4..29266fb8 100644
--- a/src/app/App.js
+++ b/src/app/App.js
@@ -2129,11 +2129,28 @@ export function App({ store, initialStatusMessage }) {
         }
         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.");