ConPTY DSR CPR on resize can interrupt in-flight (long-term) DCS (or APC or ...)

[DHowett]

This will impact tmux control mode, as ConPTY will send \x1B to terminal and promptly terminate the in-flight exchange.

All in-band signaling from ConPTY must be suppressed when passing through a DCS. Fortunately, nobody will be querying the cursor position to know it hasn't updated.

[j4james]

FYI, an endless sixel image is another easy way to demonstrate this issue.