Fix backward search in view mode for the 1st line

Used to stop on the second line.
Fix off-by-one error in view.c:find_next()

Didn't caused problems, but valgrind found it.
Fix view mode highlighting for multi-byte chars

Thanks to filterfalse.
Merge branch 'fix-view-mode-issues'

Fix backward search in view mode for the first line.

Fix view mode highlighting for multi-byte characters.
Thanks to filterfalse.