Use wxDynamicCast() instead of IsKindOf() checks.

wxDynamicCast() is less verbose (due to the absence of "CLASSINFO") and more
compatible with the standard dynamic_cast<>, so prefer to use it when possible.

See #14356.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71624 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/utilscmn.cpp

@@ -1275,7 +1275,7 @@ wxWindow* wxFindWindowAtPoint(wxWindow* win, const wxPoint& pt)
     // Hack for wxNotebook case: at least in wxGTK, all pages
     // claim to be shown, so we must only deal with the selected one.
 #if wxUSE_NOTEBOOK
-    if (win->IsKindOf(CLASSINFO(wxNotebook)))
+    if (wxDynamicCast(win, wxNotebook))
     {
       wxNotebook* nb = (wxNotebook*) win;
       int sel = nb->GetSelection();