[PTRun]Detect full-screen games with QUNS_RUNNING_D3D_FULL_SCREEN (#3…

…0797)

* Add SHQueryUserNotificationState to NativeMethods

* Check for QUNS_RUNNING_D3D_FULL_SCREEN in IsWindowFullscreen

The current test for whether a window is full-screen (i.e. a movie or a game) is a bit of a heuristic. In certain cases however, we can *know* that a window is full-screen. Check that case first, then proceed with the existing logic

* Make spellchecker happier

src/modules/launcher/PowerLauncher/Helper/NativeMethods.cs

@@ -69,6 +69,9 @@ internal static class NativeMethods
         [DllImport("user32.DLL", CharSet = CharSet.Unicode)]
         internal static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
 
+        [DllImport("shell32.dll")]
+        public static extern int SHQueryUserNotificationState(out UserNotificationState state);
+
         public static string[] CommandLineToArgvW(string cmdLine)
         {
             IntPtr argv = IntPtr.Zero;
@@ -242,4 +245,15 @@ internal enum WM
         TRAYMOUSEMESSAGE = 0x800, // WM_USER + 1024
         APP = 0x8000,
     }
+
+    internal enum UserNotificationState : int
+    {
+        QUNS_NOT_PRESENT = 1,
+        QUNS_BUSY,
+        QUNS_RUNNING_D3D_FULL_SCREEN,
+        QUNS_PRESENTATION_MODE,
+        QUNS_ACCEPTS_NOTIFICATIONS,
+        QUNS_QUIET_TIME,
+        QUNS_APP,
+    }
 }

src/modules/launcher/PowerLauncher/Helper/WindowsInteropHelper.cs

@@ -112,6 +112,15 @@ internal enum INPUTTYPE : uint
 
         public static bool IsWindowFullscreen()
         {
+            // First, check to see if a game is fullscreen, if so, we definitely have
+            // a full-screen window
+            UserNotificationState state;
+            if (Marshal.GetExceptionForHR(NativeMethods.SHQueryUserNotificationState(out state)) == null &&
+                state == UserNotificationState.QUNS_RUNNING_D3D_FULL_SCREEN)
+            {
+                return true;
+            }
+
             // get current active window
             IntPtr hWnd = NativeMethods.GetForegroundWindow();