Allow moving an insertion marker leftwards, take 2 #252
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By recognising an insertion marker as invalid if localConnection has changed, not just if highlightedConnection has changed.
This is sort of a duplicate review of #236, which I merged, then realised I'd hadn't actually tested it and a typo broke the insertion markers. I reverted it, and thought I'd err on the side of caution in sending for review again. Sorry for the mess!