Draw multicursor correctly in Visual Mode

[Platzer]

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• Commit message has a short title & issue references
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I did not create an issue for that, so here is the thing. In Visual Multicursor Mode no decorator for multicursor where drawn, and also the selection start was not drawn correctly.

Now it looks like:

[xconverge]

Awesome! I love these types of changes. They definitely help polish things up

[xconverge]

Does this make sense for Visual block mode as well?

[johnfn]

Yeah, this one looks good to me. :)