anchordocking: use MakeFullyVisible

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41972 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: use MakeFullyVisible

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41973 4005530d-fff6-0310-9dd1-cebe43e6787f