Show make sure to flush hidden exception to screen....
Show make sure to flush hidden exception to screen.
This is really unlikely but can happen if the exception is raised from
within a stack of hidden frame, in which case we do want to say there
were some hidden frames.
I guess in that case we actually really want to not hide that last one,
but this might really be a rare case.
This is already fixed in the backport to 7.x
