1 files changed, 50 insertions, 0 deletions
diff --git a/src/benchmarks/auto/changes/changing_over_isolated.qml b/src/benchmarks/auto/changes/changing_over_isolated.qml
new file mode 100644
index 0000000..72f9f1a
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+++ b/src/benchmarks/auto/changes/changing_over_isolated.qml
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+import QtQuick 2.0
+import QmlBench 1.0
+
+// This benchmark determines if clipping two subtrees isolates them,
+// such that one changing subtree won't affect performance because
+// of the other.
+CreationBenchmark {
+    id: root;
+    count: 1000;
+    staticCount: 2000
+
+    // Boolean because: isolating via clip either keeps performance good, or
+    // performance is awful if we break it.
+    isBooleanResult: true;
+
+    // Create a static subtree of items. This tree does not change.
+    Item {
+        anchors.fill: parent
+        clip: true
+        Repeater {
+            id: repeater
+            model: root.count
+
+            Rectangle {
+                color: Qt.hsla(QmlBench.getRandom(), 0.9, 0.4)
+                width: 20
+                height: 20
+                x: QmlBench.getRandom() * root.width
+                y: QmlBench.getRandom() * root.height
+
+                Text {
+                    color: "white"
+                    text: "X"
+                    anchors.centerIn: parent
+                    font.pixelSize: 10
+                }
+            }
+        }
+    }
+
+    // Create a subtree containing a single item. This tree does change.
+    Item {
+        anchors.fill: parent
+        clip: true
+        Text {
+            anchors.centerIn: parent
+            text: "test: " + root.t;
+        }
+    }
+}