[Ohrrpgce] SVN: teeemcee/9088 Fix bug where textwidth was miscalculated if the final character was a n

[subversion at HamsterRepublic.com]

teeemcee
2017-07-26 04:58:20 -0700 (Wed, 26 Jul 2017)
402
Fix bug where textwidth was miscalculated if the final character was a newline.

The width of the final line was ignored.
This affected text slices.

However I didn't fix the similar bug where textsize().h is wrong if the
final character is a newline: there's no blank at the end.
(That's inconsistent with how text slice size is calculated. This doesn't
affect text slices, since they use wordwrap().)
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U   wip/allmodex.bas