[PATCH setup] Make Enter in the user URL box cause ADD instead of NEXT

[Ken Brown]

On 12/5/2017 7:58 AM, Jon Turney wrote:
> Please apply.

Done.

> The search textbox on the package chooser page needs the same fix.

It's not immediately clear to me how to do this, since I don't know what 
the default pushbutton should be while the user is typing in the search box.

One possibility is to convert the label "Search" to the left of the box 
to a SEARCH pushbutton, whose effect is to call OnTimerMessage().  If we 
make this the default, then pressing Enter will cause the search filter 
to immediately take effect, which is probably what the user expects.

Or do you have a better idea?

Ken