Merge branch 'aui-auto-uninit'

Call wxAuiManager::UnInit() automatically.

Closes #14145.

samples/aui/auidemo.cpp

@@ -116,8 +116,6 @@ public:
             const wxSize& size = wxDefaultSize,
             long style = wxDEFAULT_FRAME_STYLE | wxSUNKEN_BORDER);
 
-    ~MyFrame();
-
     wxAuiDockArt* GetDockArt();
     void DoUpdate();
 
@@ -1016,11 +1014,6 @@ MyFrame::MyFrame(wxWindow* parent,
     m_mgr.Update();
 }
 
-MyFrame::~MyFrame()
-{
-    m_mgr.UnInit();
-}
-
 wxAuiDockArt* MyFrame::GetDockArt()
 {
     return m_mgr.GetArtProvider();