Scope visualizer incorrectly draws borders when line wrapping is enabled

[pokey]

When line wrapping is enabled, if a single scope crosses the point where the line wraps, VSCode makes it appear as tho the scope ends and begins again. For example, for "visualize sentence":

Note how this is one sentence, but appears to be two. The problem is that we set the scope to have right and left borders, which VSCode then "helpfully" draws both times it renders the pieces of the highlight

I don't think there's any thing we can do to fix this, but maybe we should search for / file an issue for a VSCode api to detect line wrapping position. That api could potentially be part of a visual column api that they could expose to help us with #1586