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J, LeeAnne,

Questions: (1) is this a known bug?

Don't know, hadn't noticed. Though I usually post in plain text, I also use inline quoting and so seldom leave anything for the ellipses to cover up.

On the other hand, this message was sent in plain text and the ellipses worked. So perhaps it has to do with particular quoting styles in plain text.
/g/GroupManagersForum/message/1330

What does this actually do?

It causes any arriving plain text message to be converted to a formatted message.

More exactly, an incoming message with only a text/plain message body is converted to one which has both the text/plain original and a text/HTML conversion as MIME multipart/alternatives.

(2) what are the downsides to
using the setting "force HTML email"?

One downside is that it converts a plain-text quote (the kind I use, with > on the left) into an HTML blockquote - but doesn't style it to include the customary vertical bar on the left. At least, not when received by email - the bar does appear on site at Groups.io (probably by way of an overall page style).

A minor downside might be the increased size of the message, containing over twice as much body text. But this is likely to be negligible in most cases.

It might have an effect on vision-impaired users, good or bad. The converted message will use a default font and size for HTML, which may not be the same as that used for plain text, depending on the receiving member's email interface.

Most might consider it an upside that the converted message will have the formatted style of group links in the footer, rather than the plain text style.

Just wondering these things too, and if the ellipses algorithm (what
ever that is!) ...

You can see it at work on the message cited above. Joseph's reply is followed by an ellipses button [...]. You can toggle that button to see or hide a trailing quote (of the message he replied to) which was in his reply.

... can be tweaked to work for the plain text emailers?

It doesn't always fail. I think it is supposed to work, so maybe the failing cases are fodder for [email protected]

Shal