bug#37826: Very annoying autoraise client/server behavior with -t option

[Carlos Pita]

> I wasn't talking about questions, I was talking about signaling an
> error.

Ok,  by "requiring intervention" I was referring to both situations,
errors and questions. Regarding errors, nothing special happens, I've
added an error signal at the beginning of sh-mode, unsurprisingly the
error is just buried in the messages buffer and only shown in the
minibuffer of a frame that might be well hidden behind other app
windows and is never risen because of the error.