No number entered should recall last dialed number when tapping Dial

[hrw@…]

One shy developer told that when no number entered should recall last dialed
number when tapping Dial.

[hrw@…]

I think that by default Dial button should be disabled - we have calls history
on second tab.

[graeme@…]

Recall the last dialed would echo the behaviour of every phone I have ever owned.

[chris@…]

Every phone I've owned (ranging across Ericsson, Sony Ericsson, Siemens, Nokia,
Motorola, Philips and Samsung) shows the last-dialled call history when I press
the dial button with no number input.

I think this is good behaviour - I usually only dial 3 or 4 numbers, but I don't
often dial the same number twice in a row (and I imagine this is the pattern for
a lot of other mobile-phone users) - this works great for that situation and if
you do tend to just dial one number, it's only one extra key-press anyway.

[hrw@…]

Graeme: This is true on phones which give you call history when you press DIAL
button. Neo gives DialPad? instead.

[mickey@…]

Showing the last number on first tap of dial, then being able to change this
before pressing dial for the 2nd time, is what I would prefer. Please make it so
and let's reconsider if we get lots of complaints (which I doubt).

[roman.moravcik@…]

Show dialed history on dialing empty number

[thomas@…]

I've committed Roman's patch, but altered it slightly to select the first item
in the on_filter_changed() callback rather than in moko_history_set_filter().
This is more desirable as it also makes sure an item is always selected when the
user changes the filter.

Although this doesn't resolve the feature request exactly as described, I think
it is a better situation that trying to dial a blank number. It also solves the
problem of having no previously dialed numbers by displaying this information
rather than attempting to fill in the dialer display.