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

[Olivier Tilloy]

Review: Needs Fixing

When dragging the list view downwards such that it overshoots, the items within it are not clipped. They are correctly clipped when dragging upwards. Actually, they are being clipped, but it looks like the container that clips them is too tall?
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https://code.launchpad.net/~fboucault/webbrowser-app/combo_box_better_ux/+merge/316571
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