> I honestly don't see what real value it adds

It wastes 20 or whatever pixels for no good reason is one issue. I generally 
keep the window wide enough that my ~80 chars of code would fit, so not only 
showing a really long scrollbar wastes vertical screen space but it makes me 
think I screwed up and have a really long line. Also the scroll thumb doesn't 
actually reflect the width of the lines properly so it's even more misleading. 
I can always tell if an editor is using Scintilla by whether it has 
broken/buggy horizontal scrollbar :)

> I guess would require altering Scintilla itself to store layout length in the 
> line data itself

I tend to agree it should be added to Scintilla proper, turned off by default. 
Then editors could choose whether to have a broken scrollbar, or to enable to 
fix if a file is under a certain size or whatever.

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