Using nightly build of 6/11/01. 1) Create a new message. 2) Send the message 3) While the message is attempting to be sent (the new window with the progess bar pops up), click on the cancel button to stop the sending of the message. 4) Get the dialog box asking if you want to cancel it, say 'yes'. 5) The progress bar for the sending of the message (in the separate window from the compose window) which tells you that the message is currently being sent doesn't go away. There is no way to close this window because there's no close button on it. I would expect when my message send is cancelled that this little window telling me my message is being sent would go away.
Dup of 85591 (bad bugzilla!)