don't cache tray protocol availability result in wxTaskBarIconAreaBase::IsProtocolSupported(), it may change at runtime

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55992 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/taskbar.cpp

@@ -59,9 +59,6 @@ wxTaskBarIconAreaBase::wxTaskBarIconAreaBase()
 }
 
 bool wxTaskBarIconAreaBase::IsProtocolSupported()
-{
-    static int s_supported = -1;
-    if (s_supported == -1)
 {
     Display *display = GDK_DISPLAY();
     Screen *screen = DefaultScreenOfDisplay(display);
@@ -73,10 +70,7 @@ bool wxTaskBarIconAreaBase::IsProtocolSupported()
 
     Window manager = XGetSelectionOwner(display, atom);
 
-        s_supported = (manager != None);
-    }
-
-    return (bool)s_supported;
+    return (manager != None);
 }
 
 //-----------------------------------------------------------------------------