better check for oculus display in oculus legacy plugin because the sdk is buggy

plugins/oculusLegacy/src/OculusLegacyDisplayPlugin.cpp

@@ -66,17 +66,46 @@ bool OculusLegacyDisplayPlugin::isSupported() const {
     }
 
     auto hmd = ovrHmd_Create(0);
+
+    // The Oculus SDK seems to have trouble finding the right screen sometimes, so we have to guess
+    // Guesses, in order of best match:
+    //  - resolution and position match
+    //  - resolution and one component of position match
+    //  - resolution matches
+    //  - position matches
+    QList<int> matches({ -1, -1, -1, -1 });
     if (hmd) {
         QPoint targetPosition{ hmd->WindowsPos.x, hmd->WindowsPos.y };
+        QSize targetResolution{ hmd->Resolution.w, hmd->Resolution.h };
         auto screens = qApp->screens();
         for(int i = 0; i < screens.size(); ++i) {
             auto screen = screens[i];
             QPoint position = screen->geometry().topLeft();
-            if (position == targetPosition) {
+            QSize resolution = screen->geometry().size();
-                _hmdScreen = i;
+
+            if (position == targetPosition && resolution == targetResolution) {
+                matches[0] = i;
+            } else if ((position.x() == targetPosition.x() || position.y() == targetPosition.y()) &&
+                resolution == targetResolution) {
+                matches[1] = i;
+            } else if (resolution == targetResolution) {
+                matches[2] = i;
+            } else if (position == targetPosition) {
+                matches[3] = i;
+            }
+        }
+    }
+
+    for (int screen : matches) {
+        if (screen != -1) {
+            _hmdScreen = screen;
             break;
         }
     }
+
+    if (_hmdScreen == -1) {
+        qDebug() << "Could not find Rift screen";
+        result = false;
     }
   
     ovr_Shutdown();