Use CSS generated content for diff filler
Official development repository for Vim's builtin TOhtml plugin
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fritzophrenic
Look into generated content (in particular the CSS "leader()" function) for generating diff filler: https://www.w3.org/TR/css-content-3/#leaders
In theory this would let us not insert a bunch of fixed-width spaces, we might even fill the entire table cell!
Check browser support; currently too new for a page on caniuse.com. Possibly not widely supported enough to use yet!