This supports a new `helpUrl` payload property on all results. It causes results
in the view to have a help button that can be selected and picked independently
of the main part of the result. When picked, the help button loads the
`helpUrl`. It looks and acts the same as the help buttons we already have for
tip results.
The help button should be flush with the trailing edge of the result row, and it
should be selectable independently from the main part of the result. To achieve
that without disrupting things too much, I create the button inside of
`.urlbarView-row` but outside of `.urlbarView-row-inner`. The "main" part of the
row is `.urlbarView-row-inner`. I made `.urlbarView-row` have `display: flex` so
the the inner part can have `flex: 1` so it can fill up the entire row except
for the help button.
This also reworks view selection a little so that for each row, we look for
selectable elements in the row instead of assuming that the row itself is
selectable. That also lets us remove a couple of special cases for tip and
dynamic results.
Differential Revision: https://phabricator.services.mozilla.com/D105095
cde79dcab3
