Copying "nothingness" results in lots of newlines
Copying large blocks of empty cells results in newlines, when it should result in "nothing".
With #84 merged, this is now much more obvious; the visible selection doesn't match what gets copied.
The problem is here, where we are trying to detect whether we should insert a newline in the copied text or not (i.e. "reflow") when moving from one row to another.
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