Fix canvas transfer timeouts and move images out of snapshots

src/lib/canvas.ts

@@ -77,7 +77,11 @@ export function canvasReducer(state: CanvasHistory, action: CanvasAction): Canva
         data: { ...node.data, ...(node.data.kind === "frame" && node.data.subgraph && patch.width !== undefined && patch.height !== undefined ? { presentation: { ...node.data.presentation, [node.data.presentation?.collapsed ? "collapsedSize" : "expandedSize"]: { width: patch.width, height: patch.height } } } : {}), ...(patch.rotation !== undefined ? { rotation: patch.rotation } : {}), ...(patch.fontSize !== undefined ? { fontSize: patch.fontSize } : {}) },
       }) } };
     }
-    case "viewport": return { ...state, present: { ...state.present, viewport: action.viewport } };
+    case "viewport": {
+      const before = state.present.viewport;
+      if (Math.abs(before.x - action.viewport.x) < 1e-6 && Math.abs(before.y - action.viewport.y) < 1e-6 && Math.abs(before.zoom - action.viewport.zoom) < 1e-9) return state;
+      return { ...state, present: { ...state.present, viewport: action.viewport } };
+    }
     case "undo": {
       const last = state.past.at(-1);
       return last ? { past: state.past.slice(0, -1), present: { ...last, viewport: state.present.viewport }, future: [state.present, ...state.future] } : state;