So what I think happens in the deletion case I'm testing is that we delete the newline char, end up with an empty text frame, reflow, and effectively move each bit of text to the previous textframe... which means rebuilding text runs for all of them.
So what I think happens in the deletion case I'm testing is that we delete the newline char, end up with an empty text frame, reflow, and effectively move each bit of text to the previous textframe... which means rebuilding text runs for all of them.