SynEdit, Markup-HighAll: Small optimization, when text edited (better invalidation range)

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@39961 4005530d-fff6-0310-9dd1-cebe43e6787f
SynEdit: fixed final caret on replace (issue from recent changes)

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@39962 4005530d-fff6-0310-9dd1-cebe43e6787f