IDE: designer: fixed handling deactivate messages

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@39774 4005530d-fff6-0310-9dd1-cebe43e6787f
anchordocking: comment

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@39775 4005530d-fff6-0310-9dd1-cebe43e6787f