fix(rendering): do not render cursor if there's nothing to render #3439
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imsnif
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Fixes #3208
This fixes an issue where we would sometimes needlessly send an instruction to render the cursor in its current coordinates, even when the output buffer was not dirty. This affected very few cases, since normally the cursor rendering is a no-op, but in programs that render heavily to the terminal (eg. nvim floating windows) this sometimes created a flicker.