Trailing spaces removed from input document

[hildjj]

When the grammar application process finishes, trailing spaces are removed from the input file (sometimes). This happens at

code-peggy-language/client/preview.ts

Line 118 in cc2d6c4

output.replace(out);

It doesn't happen if static text is used instead of out. I've tried looking at the string in out to see if there are non-visible characters; nothing stands out. I've tried ensuring that out is not a CONS string.

Ideas welcome.