backends/x11: Ensure that Output::geometryChanged is emitted when modes change

BUG: 453696
Tested-by: Merge Service <!2454>
Part-of: <!2454>


(cherry picked from commit 8b644fee)

src/backends/x11/standalone/x11_output.cpp

@@ -64,8 +64,11 @@ bool X11Output::usesSoftwareCursor() const
 
 void X11Output::setMode(const QSize &size, int refreshRate)
 {
-    auto mode = QSharedPointer<OutputMode>::create(size, refreshRate);
-    setModesInternal({mode}, mode);
+    const auto current = currentMode();
+    if (!current || current->size() != size || current->refreshRate() != refreshRate) {
+        auto mode = QSharedPointer<OutputMode>::create(size, refreshRate);
+        setModesInternal({mode}, mode);
+    }
 }
 
 }

src/output.cpp

@@ -220,6 +220,7 @@ void Output::setModesInternal(const QList<QSharedPointer<OutputMode>> &modes, co
     }
     if (m_currentMode != oldCurrentMode) {
         Q_EMIT currentModeChanged();
+        Q_EMIT geometryChanged();
     }
 }