[Paul Ionescu <paul@xxxxxxxx>]

Hi all,

I was playing around with "Add expression..." from display filters and I
think that we can do some minor improvements like:

Add at least two more buttons to the Filter Expression dialog like "and"
and "or" besides "Accept" and "Close".
These two buttons should do what they are supossed to do: 
- If you press "and" you will construct another expression which will be
logical and-ed to the previous one.
- If you press "or" you will construct another expression which will be
logical or-ed to the previous one.
This way you can construct complex expressions only using the GUI.

Another thing should be another relation like "not present":
if you select "not present" as a relation for a PROTOCOL, the result
should  be "! PROTOCOL".

And at last, there should be a field in the bottom of the dialog box,
just before the buttons, where you can see the expression you made so
far.

What do you think about these improvements ?