CHG: scrolled list's sort will adjust scrollbar offset

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6903 8aca7d54-2c30-db11-9de9-000461428c89
remove dead code

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6904 8aca7d54-2c30-db11-9de9-000461428c89
FIX: crash with twoclick tools if tiles have vanished

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6905 8aca7d54-2c30-db11-9de9-000461428c89