Redisplay last screen when "?" is entered at prompt.

In case another process has written to stdout and either overwritten the last screen or pushed it out of the scrollback buffer. In this case, simply re-displaying the key shortcuts for each choice without displaying the actual choices and the last screen is not much help.

Start by locating the CLI prompt handling for the "?" response and read how the last screen and choice shortcuts are currently displayed. Done means entering "?" restores the previous screen and its choices after stdout has overwritten or displaced it; verify the behavior with the relevant CLI tests.

Written by the indexing model from the issue text.