QmlCompiler: On MoveReg, check if we need to move at all

As we don't store void, null and empty lists, moving those is a noop.
Don't generate invalid code for that.

Change-Id: Ica6714acd0ce8a5ddca44d9a397e776eb3df4247
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
(cherry picked from commit 074b66e0073b55d32060ffd542a02c811ad763a8)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/auto/qml/qmlcppcodegen/data/moveRegVoid.qml b/tests/auto/qml/qmlcppcodegen/data/moveRegVoid.qml
new file mode 100644
index 0000000000..f1e78babba
--- /dev/null
+++ b/tests/auto/qml/qmlcppcodegen/data/moveRegVoid.qml
@@ -0,0 +1,20 @@
+import QtQuick
+
+Rectangle {
+    id: root
+    property bool translucency: false
+
+    gradient: Gradient {
+        id: grad
+    }
+
+    onTranslucencyChanged: {
+        if (translucency) {
+            root.color = "transparent";
+            root.gradient = null;
+        } else {
+            root.color = "white";
+            root.gradient = grad;
+        }
+    }
+}