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

[Olivier Tilloy]

Review: Needs Fixing

webbrowser_app.tests.test_tabs.TestTabsManagement.test_ctrl_click_open_link_in_next_tab appears to be reliably failing in narrow mode.
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https://code.launchpad.net/~fboucault/webbrowser-app/background_open_tabs_adjacent/+merge/316226
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