Handlers for this event expect to get wxSpinEvent but wxMSW, wxGTK1 and wxQT
sent an object of base wxCommandEvent class which resulted in invalid memory
access in the handlers when using the derived class methods such as Veto().
Closes#16948.
This merges in the latest sources from GSoC 2014 wxQt project with just a few
minor corrections, mostly undoing wrong changes to common files in that branch
(results of a previous bad merge?) and getting rid of whitespace-only changes.
Also remove debug logging from wxGrid.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77455 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775