Fix off-by-one error for reversed UI-selection

This is a further improvement on #249 where the selection would be
non-empty due to an seemingly unnecessary `+ 1`. This might have been
necessary at one point, but this seems no longer the case.

Remove this addition to make sure that a reversed selection isn't
suddenly one character longer.
Merge pull request #288 from albertdev/smallfixes

Fix off-by-one error for reversed UI-selection