[Merge] lp:~fboucault/webbrowser-app/combo_box_better_ux into lp:webbrowser-app/staging

[Olivier Tilloy]

Review: Needs Fixing

If I browse to https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_select and give keyboard focus to the select dropdown, pressing Enter/Return should open the menu. Instead it opens it and closes it right away.
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https://code.launchpad.net/~fboucault/webbrowser-app/combo_box_better_ux/+merge/316571
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