pending STDIN and --height=~80% delay first paint indefinitely

In a nutshell, this example fails in the sense that the user won't see anything on a 30 line terminal:

tail -n10 -f /etc/services | fzf --height=~80%

My guess is fzf waits indefinitely for STDIN to either close or exceed 80% of $LINES.

The cleanest solution would be to show the interface with the received lines, then increase size up to 80% when more arrives. Alternatively timeout and assume STDIN will deliver 80% of $LINES and adjust height for that?

Or just add this to the limitations of adaptive height in the --help text.