The minimum sizes of the floating window are made on the basis of Doc…

…kMinSizes children. Fix showing floating window again if it was hidden by cross button

source/Components/Xceed.Wpf.AvalonDock/Controls/LayoutAnchorableFloatingWindowControl.cs

@@ -52,6 +52,23 @@ internal LayoutAnchorableFloatingWindowControl( LayoutAnchorableFloatingWindow m
       HideWindowCommand = new RelayCommand( ( p ) => OnExecuteHideWindowCommand( p ), ( p ) => CanExecuteHideWindowCommand( p ) );
       CloseWindowCommand = new RelayCommand( ( p ) => OnExecuteCloseWindowCommand( p ), ( p ) => CanExecuteCloseWindowCommand( p ) );
       UpdateThemeResources();
+      MinWidth = _model.RootPanel.CalculatedDockMinWidth();
+      MinHeight = _model.RootPanel.CalculatedDockMinHeight();
+
+      LayoutRoot root = _model.Root as LayoutRoot;
+      if (root != null)
+      {
+        root.Updated += OnRootUpdated;
+      }
+    }
+
+    private void OnRootUpdated(object sender, EventArgs e)
+    {
+      if (_model?.RootPanel != null)
+      {
+        MinWidth = _model.RootPanel.CalculatedDockMinWidth();
+        MinHeight = _model.RootPanel.CalculatedDockMinHeight();
+      }
     }
 
     internal LayoutAnchorableFloatingWindowControl( LayoutAnchorableFloatingWindow model)
@@ -228,10 +245,23 @@ internal override void UpdateThemeResources( Xceed.Wpf.AvalonDock.Themes.Theme o
 
     private void _model_PropertyChanged( object sender, System.ComponentModel.PropertyChangedEventArgs e )
     {
-      if( e.PropertyName == "RootPanel" &&
-          _model.RootPanel == null )
+      switch (e.PropertyName)
       {
-        InternalClose();
+        case "RootPanel":
+          if (_model.RootPanel == null)
+          {
+            InternalClose();
+          }
+
+          break;
+
+        case "IsVisible":
+          if (_model.IsVisible != IsVisible)
+          {
+            Visibility = _model.IsVisible ? Visibility.Visible : Visibility.Hidden;
+          }
+
+          break;
       }
     }