IDE: use Sender sourceeditor instead of last active sourceeditor

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@39707 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: update active sourceeditor on KeyDown

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@39708 4005530d-fff6-0310-9dd1-cebe43e6787f