fix beep sound when closed from taskbar

Changelog.md

@@ -4,6 +4,7 @@
 
 - fix in the learn window of input editor, whole day spent :-(
 - fix black one pixel bar on right side by truncating instead of rounding
+- fix beep sound when closed from taskbar
 
 
 5.4.7.4 Beta (not yet released)

mpv.net/WPF/EverythingWindow.xaml.cs

@@ -161,4 +161,4 @@ namespace mpvnet
             }
         }
     }
-}
+}

mpv.net/WinForms/MainForm.cs

@@ -632,7 +632,7 @@ namespace mpvnet
             }
 
             // beep sound when closed using taskbar due to exception
-            //if (!IsDisposed)
+            if (!IsDisposed)
                 base.WndProc(ref m);
         }