[BUG_FIXED] Fix DocMap's syntax highlighting doesn't update while current doc apply a new syntax highlighting.

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1266 f5eea248-9336-0410-98b8-ebc06183d4e3
[RELEASE] Notepad++ 6.6.8 Release.

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1267 f5eea248-9336-0410-98b8-ebc06183d4e3