Using print_container causes CPR codes to leak to terminal

Here is a minimal repro (using version 3.0.7, 3.0.18):

from prompt_toolkit.shortcuts import print_container
from prompt_toolkit.widgets import HorizontalLine

print_container(HorizontalLine())

$ python3 cli-foo.py 
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
$ ;1R

Same result for both iTerm2 and OSX built-in Terminal.

Start with the minimal Python reproduction using print_container(HorizontalLine()) and inspect the terminal output on the reported macOS terminals. Trace the print_container entry point and reproduce the trailing CPR code; done means the container renders without leaking CPR codes to the terminal.