SLIME (ver 2.29.1): REPL Font Coloring and Indentation upon TAB Breaks Frequently

[JohnKiro]

I'm not sure about the root cause that triggers this behavior, but I'm attaching a screenshot that could provide a clue (I did not try to reproduce yet).

The issue is that the font color of the repl input breaks frequently. Also when this happens, the indentation adjustment normally triggered by pressing TAB also does not work, and a completion buffer is opened instead (see screenshot).

In the occurrence I captured recently, it seems to have been triggered in the middle of displaying the output of (describe 'trace).

[JohnKiro]

Small updates (reproduction + workaround):

1. Correct behavior restored by entering a pipe "|", as in the screenshot.
2. Issue reproduced by same command (describe 'trace).

It's relieving to find a simple workaround, but I see it's still a bug.

[stassats]

I'm not seeing that here.

[JohnKiro]

I'm not seeing that here.

I'm not sure what I can check in my configuration. I'm also experiencing another annoying frequent behaviour, also related to indentation, that I'm going to report in a separate issue (though both may be related).