Update AUI floating windows position and not just size on resize.

When a window is resized, its position can change as well as its size but it
wasn't updated before. Do it now.

Closes #11421.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64454 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/aui/floatpane.cpp

@@ -157,11 +157,11 @@ wxAuiManager* wxAuiFloatingFrame::GetOwnerManager() const
 }
 
 
-void wxAuiFloatingFrame::OnSize(wxSizeEvent& event)
+void wxAuiFloatingFrame::OnSize(wxSizeEvent& WXUNUSED(event))
 {
     if (m_owner_mgr)
     {
-        m_owner_mgr->OnFloatingPaneResized(m_pane_window, event.GetSize());
+        m_owner_mgr->OnFloatingPaneResized(m_pane_window, GetRect());
     }
 }