3 files changed, 14 insertions, 2 deletions
diff --git a/src/compositor/compositor_api/qwaylandcompositor.cpp b/src/compositor/compositor_api/qwaylandcompositor.cpp
index 8d6815924..0ba5838e0 100644
--- a/src/compositor/compositor_api/qwaylandcompositor.cpp
+++ b/src/compositor/compositor_api/qwaylandcompositor.cpp
@@ -461,6 +461,16 @@ QWaylandOutput *QWaylandCompositor::defaultOutput() const
     return d->defaultOutput();
 }
 
+void QWaylandCompositor::setDefaultOutput(QWaylandOutput *output)
+{
+    Q_D(QWaylandCompositor);
+    if (d->outputs.size() && d->outputs.first() == output)
+        return;
+    d->outputs.removeOne(output);
+    d->outputs.prepend(output);
+    defaultOutputChanged();
+}
+
 QList<QWaylandOutput *> QWaylandCompositor::outputs() const
 {
     Q_D(const QWaylandCompositor);
diff --git a/src/compositor/compositor_api/qwaylandcompositor.h b/src/compositor/compositor_api/qwaylandcompositor.h
index a6b3cfee8..6f0abf02b 100644
--- a/src/compositor/compositor_api/qwaylandcompositor.h
+++ b/src/compositor/compositor_api/qwaylandcompositor.h
@@ -70,7 +70,7 @@ class Q_COMPOSITOR_EXPORT QWaylandCompositor : public QObject, public QWaylandEx
     Q_DECLARE_PRIVATE(QWaylandCompositor)
     Q_PROPERTY(QByteArray socketName READ socketName WRITE setSocketName)
     Q_PROPERTY(bool retainedSelection READ retainedSelectionEnabled WRITE setRetainedSelectionEnabled)
-    Q_PROPERTY(QWaylandOutput *defaultOutput READ defaultOutput NOTIFY defaultOutputChanged)
+    Q_PROPERTY(QWaylandOutput *defaultOutput READ defaultOutput WRITE setDefaultOutput NOTIFY defaultOutputChanged)
     Q_PROPERTY(bool useHardwareIntegrationExtension READ useHardwareIntegrationExtension WRITE setUseHardwareIntegrationExtension NOTIFY useHardwareIntegrationExtensionChanged)
     Q_PROPERTY(QWaylandInputDevice *defaultInputDevice READ defaultInputDevice NOTIFY defaultInputDeviceChanged)
 
@@ -97,6 +97,7 @@ public:
     Q_INVOKABLE QWaylandOutput *outputFor(QWindow *window) const;
 
     QWaylandOutput *defaultOutput() const;
+    void setDefaultOutput(QWaylandOutput *output);
     QList<QWaylandOutput *> outputs() const;
 
     uint currentTimeMsecs() const;
diff --git a/src/compositor/compositor_api/qwaylandcompositor_p.h b/src/compositor/compositor_api/qwaylandcompositor_p.h
index a9bcdd5a4..4a257e459 100644
--- a/src/compositor/compositor_api/qwaylandcompositor_p.h
+++ b/src/compositor/compositor_api/qwaylandcompositor_p.h
@@ -172,7 +172,8 @@ void QWaylandCompositorPrivate::removeClient(QWaylandClient *client)
 void QWaylandCompositorPrivate::addOutput(QWaylandOutput *output)
 {
     Q_ASSERT(output);
-    Q_ASSERT(!outputs.contains(output));
+    if (outputs.contains(output))
+        return;
     outputs.append(output);
 }