[sigc] High priority connection ? [on 1.2.5]

[Eric NICOLAS <nicolas00 wanadoo fr>]

Hi,

We are building high performance applications here and we
are keen on controlling the order of the notifications from
a signal to a slot.

I've seen that SignalBase features "push_front" as well as
"push_back" operations on its connections lists, but the
only one accessible via SignalX::connect() is "push_back".

Would it make sense to add a new method:

	SignalX::connectHighPriority()
	
with the same interfaces as connect(), but which would use
push_front() instead of push_back() when adding the slot
node ?

Thanks.