[Ohrrpgce] SVN: teeemcee/11524 Speedup textbox_preview_line by not using textwidth

[subversion at HamsterRepublic.com]

teeemcee
2019-12-30 21:58:53 -0800 (Mon, 30 Dec 2019)
254
Speedup textbox_preview_line by not using textwidth

Time spent in textwidth was a pretty significant part of the TextboxBrowser
load time.
In future I think I'll add a fast path to textwidth for non-wrapped text.
Should be possible to speed it up a lot.
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U   wip/loading.rbas