If you copy "\128" to the clipboard, and then paste it back, you get a solid block character instead of the 4-character escape sequence. Somewhere in the paste handler, it's actually converting the escape sequence.

Oddly, it only does this if the value is 128 or higher. Pasting "\127" works fine.

Also, it doesn't happen with hex escape codes, so "\x80" works fine.

(As an aside, the bug where you can't use the Del key at the first character of the buffer is still there too...)