Default minimize muc on "close"
problem
When closing a muc window there is a dialog/popup asking if you want to leave the group chat.
analysis
For regular users the concept of leaving and then not receiving any more messages for that muc is strange, they also expect to be able to close windows without dialogs.
enhancement recommendation
Make it default to minimize muc on "close" and add a menu item for when right-clicking a muc tab to "Leave", then it's alright to display the dialog when clicking the leave-menu-item.
Another way is to change the close-dialog, instead of Ok and Cancel, have three buttons: Leave, Minimize and Cancel. But then still the user will have a popup when closing a window which damages usability.