LCL: TTreeView.ClearSelection, patch 25014

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42776 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: clean up

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42777 4005530d-fff6-0310-9dd1-cebe43e6787f