Closes#3511, Closes#3512, Closes#3526
- show* methods now close existing passive notifications by
default. They also now take an optional options object where
existing parameters such as "delayed" and "defaultErrorText"
can be passed in as well as the new "doNotClosePassive" flag.
- Removed all explicit calls to notifications.closePassive except
for the few places where it makes sense to call it separately.