title: Show form that showDialog from mainForm won't block it, but closing mainForm will close it
body: <p>how yo show a form which needs to run synchronously. I tried running application.run from a queueworker of a threadpool- but I had some invalid handles sometime. tried using a regular thread but then when main form closes it doesn't close this- and I don't really like the idea of killing the thread on_formclosing. if I use form.show it's fine besides that fact that any showdialog from the main form will block also this. What's the best way to handle this?</p>