More fullscreen fixes

1. Fix app leaving full screen not being removed from list while inactive
2. Always use bounds validation with auto-hide appbar to prevent maximized windows hiding the appbar

Author: dremin

src/ManagedShell.AppBar/AppBarWindow.cs

@@ -328,8 +328,20 @@ protected virtual void OnAutoHideAnimationComplete(bool isHiding)
             }
         }
 
-        protected virtual void OnFullScreenEnter()
+        protected virtual void OnFullScreenEnter(FullScreenApp app)
         {
+            if (AppBarMode != AppBarMode.Normal && app.fromTasksService)
+            {
+                // If we are not reserving space, then some maximized windows could be mistaken as full-screen.
+                // Use the same strict bounds checks as full-screen apps with fromTasksService=false.
+                if (!(app.rect.Top == app.screen.Bounds.Top && app.rect.Left == app.screen.Bounds.Left &&
+                    app.rect.Bottom == app.screen.Bounds.Bottom && app.rect.Right == app.screen.Bounds.Right))
+                {
+                    ShellLogger.Debug($"AppBarWindow: {Name} on {Screen.DeviceName} ignoring full-screen app");
+                    return;
+                }
+            }
+
             ShellLogger.Debug($"AppBarWindow: {Name} on {Screen.DeviceName} conceding to full-screen app");
 
             Topmost = false;
@@ -369,23 +381,23 @@ private void OnClosing(object sender, CancelEventArgs e)
 
         private void FullScreenApps_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
         {
-            bool found = false;
+            FullScreenApp app = null;
 
-            foreach (FullScreenApp app in _fullScreenHelper.FullScreenApps)
+            foreach (FullScreenApp _app in _fullScreenHelper.FullScreenApps)
             {
-                if (app.screen.DeviceName == Screen.DeviceName || app.screen.IsVirtualScreen)
+                if (_app.screen.DeviceName == Screen.DeviceName || _app.screen.IsVirtualScreen)
                 {
-                    // we need to not be on top now
-                    found = true;
+                    // there is a full screen app on our screen
+                    app = _app;
                     break;
                 }
             }
 
-            if (found && Topmost)
+            if (app != null && Topmost)
             {
-                OnFullScreenEnter();
+                OnFullScreenEnter(app);
             }
-            else if (!found && !Topmost)
+            else if (app == null && !Topmost)
             {
                 OnFullScreenLeave();
             }

src/ManagedShell.AppBar/FullScreenApp.cs

@@ -1,11 +1,13 @@
-using System;
+using ManagedShell.Interop;
+using System;
 
 namespace ManagedShell.AppBar
 {
     public class FullScreenApp
     {
         public IntPtr hWnd;
         public ScreenInfo screen;
+        public NativeMethods.Rect rect;
         public string title;
         public bool fromTasksService;
     }

src/ManagedShell.AppBar/FullScreenHelper.cs

@@ -49,6 +49,12 @@ private void TasksService_Event(object sender, EventArgs e)
 
         private void TasksService_FullScreenChanged(object sender, FullScreenEventArgs e)
         {
+            if (InactiveFullScreenApps.Count > 0 && InactiveFullScreenApps.Any(app => app.hWnd == e.Handle))
+            {
+                // If this window is in the inactive list, remove it--the message that triggered this event takes precedence
+                InactiveFullScreenApps.Remove(InactiveFullScreenApps.First(app => app.hWnd == e.Handle));
+            }
+
             if (FullScreenApps.Any(app => app.hWnd == e.Handle) == e.IsEntering)
             {
                 if (e.IsEntering)
@@ -63,12 +69,6 @@ private void TasksService_FullScreenChanged(object sender, FullScreenEventArgs e
                 return;
             }
 
-            if (InactiveFullScreenApps.Count > 0 && InactiveFullScreenApps.Any(app => app.hWnd == e.Handle))
-            {
-                // If this window is in the inactive list, remove it because it is no longer needed
-                InactiveFullScreenApps.Remove(InactiveFullScreenApps.First(app => app.hWnd == e.Handle));
-            }
-
             if (e.IsEntering)
             {
                 // When TasksService gives us a full-screen window handle, trust that it is full-screen in terms of bounds
@@ -224,10 +224,10 @@ private void updateFullScreenWindows()
         private FullScreenApp getFullScreenApp(IntPtr hWnd, bool fromTasksService = false)
         {
             ScreenInfo screenInfo = null;
+            Rect rect = GetEffectiveWindowRect(hWnd);
 
             if (!fromTasksService)
             {
-                Rect rect = GetEffectiveWindowRect(hWnd);
                 var allScreens = Screen.AllScreens.Select(ScreenInfo.Create).ToList();
                 if (allScreens.Count > 1) allScreens.Add(ScreenInfo.CreateVirtualScreen());
 
@@ -260,7 +260,7 @@ private FullScreenApp getFullScreenApp(IntPtr hWnd, bool fromTasksService = fals
             }
 
             // this is a full screen app
-            return new FullScreenApp { hWnd = hWnd, screen = screenInfo, title = win.Title, fromTasksService = fromTasksService };
+            return new FullScreenApp { hWnd = hWnd, screen = screenInfo, rect = rect, title = win.Title, fromTasksService = fromTasksService };
         }
 
         private Rect GetEffectiveWindowRect(IntPtr hWnd)