IDE: messages: right click on not selected line selects it

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45869 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: clean up

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45870 4005530d-fff6-0310-9dd1-cebe43e6787f