qdbusviewer: Set focus to services filter on show

Change-Id: Icbb7259c57b53560f7b9e1a6e039171debc26114
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

src/qdbus/qdbusviewer/qdbusviewer.cpp

@@ -171,6 +171,11 @@ void QDBusViewer::logMessage(const QString &msg)
     log->append(msg + QLatin1Char('\n'));
 }
 
+void QDBusViewer::showEvent(QShowEvent *)
+{
+    serviceFilterLine->setFocus();
+}
+
 void QDBusViewer::logError(const QString &msg)
 {
     log->append(QLatin1String("<font color=\"red\">Error: </font>") + msg.toHtmlEscaped() + QLatin1String("<br>"));

src/qdbus/qdbusviewer/qdbusviewer.h

@@ -86,6 +86,7 @@ private slots:
 
 private:
     void logMessage(const QString &msg);
+    void showEvent(QShowEvent *) override;
 
     QDBusConnection c;
     QString currentService;