When tidy is invoked, the messages window pops open if it is closed.
This is annoying, because it steals space or gets in the way.
My current workaround is to float the messages window, resize it as small as possible, then close it. The next time I invoke tidy, the window pops up in the upper left corner, but it is really small. It is still slightly annoying, but at least it is out of the way (PLEASE DO NOT "FIX" THIS 'BUG').
I would really like it if there was a way to turn off the messages window so that it was never displayed. It is easy to tell if Tidy isn't running due to an HTML error, and if one wants to see the messages, one could turn the messages window back on (View...Messages).
Thank you!