Displays error when ARandR is not installed

main.qml

@@ -146,7 +146,7 @@ Item {
                 text: ""
                 Component.onCompleted : {
                     backend.onError.connect(function(errMsg) {
-                        errorText.text = "";
+                        errorText.text = "";    // To trigger onTextChanged signal
                         errorText.text = errMsg;
                     });
                 }

qml/AppWindow.qml

@@ -234,9 +234,12 @@ ApplicationWindow {
             anchors.fill: parent
             Text {
                 horizontalAlignment: Text.AlignHCenter
+                Layout.fillWidth: true
+                wrapMode: Text.WordWrap
                 text: errorText.text
                 onTextChanged: {
                     if (text) {
+                        busyDialog.close();
                         errorDialog.open();
                     }
                 }

virtscreen.py

@@ -562,7 +562,8 @@ class Backend(QObject):
             if not shutil.which(arg.split()[0]):
                 continue
             program.run(arg)
-            break            
+            return
+        self.onError.emit('Failed to find a display settings program. Please install ARandR package.')
 
     @pyqtSlot()
     def stopVNC(self, force=False):