Fix QQmlProperty and Connections for properties starting with '_'

We do a weird renaming for the change handler of properties starting
with '_', now we do it at least in a consistent way.

Fixes: QTBUG-82017
Change-Id: I1535a5ee462f3a344c972461f1fb954f039aa854
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmlproperty/tst_qqmlproperty.cpp b/tests/auto/qml/qqmlproperty/tst_qqmlproperty.cpp
index a15c00ad62..864a47e998 100644
--- a/tests/auto/qml/qqmlproperty/tst_qqmlproperty.cpp
+++ b/tests/auto/qml/qqmlproperty/tst_qqmlproperty.cpp
@@ -158,6 +158,8 @@ private slots:
     void copy();
 
     void nestedQQmlPropertyMap();
+
+    void underscorePropertyChangeHandler();
 private:
     QQmlEngine engine;
 };
@@ -2230,6 +2232,24 @@ void tst_qqmlproperty::nestedQQmlPropertyMap()
     QCOMPARE(success.read().toString(), QLatin1String("success"));
 }
 
+void tst_qqmlproperty::underscorePropertyChangeHandler()
+{
+    QQmlEngine engine;
+    QQmlComponent component(&engine);
+    component.setData(R"(
+        import QtQuick 2.12
+
+        Item {
+            property int __withUnderScore
+        }
+    )", QUrl::fromLocalFile("."));
+    QScopedPointer<QObject> root { component.create() };
+    QVERIFY(root);
+    QQmlProperty changeHandler(root.get(), "on__WithUnderScoreChanged");
+    QVERIFY(changeHandler.isValid());
+    QVERIFY(changeHandler.isSignalProperty());
+}
+
 QTEST_MAIN(tst_qqmlproperty)
 
 #include "tst_qqmlproperty.moc"