Comment 42 for bug 1086458

Some additional experimentation today indicates that there are actually two, related leaks.

- one caused by calling xulG.set_tab() from inside a page-level command handler
- one caused by invoking circ.checkout.print()

Clicking the 'Done' button does both. The test where I commend out the call to circ,checkout.print() revealed the first type of leak, but hid that there is actually a leak from the latter.

In other words, the leak cannot be worked around by using the print receipt button, then using F1 to reset the checkout session.