platforms/x11: Init outputs during platform initialization

plugins/platforms/x11/standalone/screens_xrandr.cpp

@@ -32,10 +32,6 @@ XRandRScreens::~XRandRScreens() = default;
 void XRandRScreens::init()
 {
     KWin::Screens::init();
-    // we need to call ScreenResources at least once to be able to use current
-    m_backend->initOutputs();
-    setCount(m_backend->outputs().count());
-    emit changed();
 
 #ifndef KWIN_UNIT_TEST
     connect(this, &XRandRScreens::changed, this, [] {

plugins/platforms/x11/standalone/x11_platform.cpp

@@ -94,7 +94,7 @@ void X11StandalonePlatform::init()
     }
     XRenderUtils::init(kwinApp()->x11Connection(), kwinApp()->x11RootWindow());
     setReady(true);
-    emit screensQueried();
+    initOutputs();
 }
 
 Screens *X11StandalonePlatform::createScreens(QObject *parent)
@@ -455,11 +455,13 @@ void X11StandalonePlatform::doUpdateOutputs()
 
     if (!Xcb::Extensions::self()->isRandrAvailable()) {
         fallback();
+        emit screensQueried();
         return;
     }
     T resources(rootWindow());
     if (resources.isNull()) {
         fallback();
+        emit screensQueried();
         return;
     }
     xcb_randr_crtc_t *crtcs = resources.crtcs();
@@ -545,6 +547,8 @@ void X11StandalonePlatform::doUpdateOutputs()
     if (m_outputs.isEmpty()) {
         fallback();
     }
+
+    emit screensQueried();
 }
 
 Outputs X11StandalonePlatform::outputs() const