Add multiline support to busyindicator

[errante]

Since you're on it, you might also want to reconsider this other suggestion.

Idea: Stop column value calculations via the Busy Spinner

Whenever a column is calculating values, a Busy Spinner appears to show there's a task in progress, but you can't interact with it beyond that. If the calculation takes a long time, the only way to stop it (aside from using Task Manager, which involv…

Also, if the text could support markup (like in a markup control), that would be great.