Fix HasFocus() for composite controls.

Comparing the result of DoFindFocus() with the main window of composite
control doesn't work as it can return a child window so HasFocus() still
returned false for a composite control such as generic wxListCtrl even when it
did have focus.

Just use FindFocus() instead of DoFindFocus() to fix this.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69788 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/wincmn.cpp

@@ -3328,9 +3328,7 @@ void wxWindowBase::DoMoveInTabOrder(wxWindow *win, WindowOrder move)
 
 bool wxWindowBase::HasFocus() const
 {
-    wxWindowBase *win = DoFindFocus();
-    return win == this ||
-           win == wxConstCast(this, wxWindowBase)->GetMainWindowOfCompositeControl();
+    return FindFocus() == this;
 }
 
 // ----------------------------------------------------------------------------