Merge pull request #401 from irihitech/dialog

Introduce IsTopLevel to OverlayDialogHost

src/Ursa/Controls/OverlayShared/OverlayDialogHost.Dialog.cs

@@ -72,7 +72,7 @@ public partial class OverlayDialogHost
     {
         if (e.Source is DialogControlBase item)
         {
-            if (item.IsFullScreen)
+            if (IsTopLevel && item.IsFullScreen)
             {
                 var top = TopLevel.GetTopLevel(item);
                 if (top is Window w)

src/Ursa/Controls/OverlayShared/OverlayDialogHost.Shared.cs

@@ -56,6 +56,7 @@ public partial class OverlayDialogHost: Canvas
     }
     
     public bool IsAnimationDisabled { get; set; }
+    public bool IsTopLevel { get; set; }
     
     static OverlayDialogHost()
     {
@@ -114,7 +115,7 @@ public partial class OverlayDialogHost: Canvas
         {
             rec.AddHandler(PointerReleasedEvent, ClickMaskToCloseDialog);
         }
-        else
+        else if(IsTopLevel)
         {
             rec.AddHandler(PointerPressedEvent, DragMaskToMoveWindow);
         }