Mark aliases as used (and potentially overwritten) by derived component

Fix #1009

internal/compiler/passes/binding_analysis.rs

@@ -467,6 +467,12 @@ fn propagate_is_set_on_aliases(component: &Rc<Component>, reverse_aliases: &mut
         let is_binding_constant =
             binding.is_constant() && binding.two_way_bindings.iter().all(|n| n.is_constant());
         if is_binding_constant && !NamedReference::new(e, name).is_externally_modified() {
+            for alias in &binding.two_way_bindings {
+                crate::namedreference::mark_property_set_derived_in_base(
+                    alias.element(),
+                    alias.name(),
+                );
+            }
             return;
         }
 

tests/cases/crashes/issue_1009_const_alias.slint

@@ -0,0 +1,25 @@
+// Copyright © SixtyFPS GmbH <info@slint-ui.com>
+// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial
+
+Button := Text { }
+
+PanelButton := HorizontalLayout {
+    property<string> button-text <=> button.text;
+    button := Button { }
+}
+
+TestCase := Window {
+    property <bool> test: pb.preferred-height == control.preferred-height;
+    pb := PanelButton {  button-text: "button1";  }
+    control := Text { text: "button1"; }
+}
+
+
+/*
+
+```rust
+let ui = TestCase::new();
+assert!(ui.get_test());
+```
+
+*/