[ui] GraphEditor: Updated bounding box to look at the actual node ite…

…m rather than the loader delegate

meshroom/ui/qml/GraphEditor/GraphEditor.qml

@@ -1384,9 +1384,11 @@ Item {
         if (first === null) {
             return Qt.rect(0, 0, 0, 0)
         }
+        // Fetch the actual delegate item from the Loader
+        first = first.item;
         var bbox = Qt.rect(first.x, first.y, first.x + first.width, first.y + first.height)
         for (var i = 0; i < root.graph.nodes.count; ++i) {
-            var item = nodeRepeater.itemAt(i)
+            var item = nodeRepeater.itemAt(i).item
             bbox.x = Math.min(bbox.x, item.x)
             bbox.y = Math.min(bbox.y, item.y)
             bbox.width = Math.max(bbox.width, item.x + item.width)