Upstream: https://github.com/musescore/MuseScore/pull/34204

From https://github.com/musescore/MuseScore/pull/34204/changes/f273501e418842351c4bda10cce32b0e329eaff1 Mon Sep 17 00:00:00 2001
From: Doron Behar <doron.behar@gmail.com>
Date: Wed, 15 Jul 2026 13:19:36 +0300
Subject: [PATCH] uicomponents: fix StyledDropdown navigation/label/dropIcon
 resolving to null

StyledDropdown exposed these three properties as aliases into an alias
declared on its internal mainItem (e.g. `property alias navigation:
mainItem.navigation`, where mainItem itself has `property alias
navigation: navCtrl`). With Qt 6.11, this two-hop alias chain resolves
to null whenever the StyledDropdown instance is created dynamically
(Qt.createComponent().createObject(), a Loader, or a ListView
delegate), which is how most dialogs including "New score" are built.
The null grouped-property writes this caused were severe enough to
abort construction of the whole enclosing dynamically-created object
tree.

Point the properties directly at the leaf items instead, bypassing the
broken two-hop resolution.

Resolves: #34091

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
--- a/src/framework/uicomponents/qml/Muse/UiComponents/StyledDropdown.qml
+++ b/src/framework/uicomponents/qml/Muse/UiComponents/StyledDropdown.qml
@@ -50,10 +50,10 @@ Item {
 
     property int popupItemsCount: 18
 
-    property alias dropIcon: mainItem.dropIcon
-    property alias label: mainItem.label
+    property alias dropIcon: dropIconItem
+    property alias label: labelItem
 
-    property alias navigation: mainItem.navigation
+    property alias navigation: navCtrl
 
     property alias isOpened: dropdownLoader.isOpened
     property alias dropdown: dropdownLoader.dropdown