[Merge] lp:~uriboni/webbrowser-app/newtabview-listviews into lp:webbrowser-app

[Olivier Tilloy]

Here is the merge request that implements the idea I described above: https://code.launchpad.net/~osomon/webbrowser-app/bookmarks-proxy-model/+merge/279277.

With a single model, only the initial instantiation of the model is costly (260ms for 100000 entries, 40ms for 10000 entries), there’s no additional overhead.

The code ended up slightly more complex than I anticipated, because I made it possible to change at runtime whether to show empty folders, and whether to prepend the homepage bookmark. That’s more code and complexity, but it’s 100% unit tested, and shields us from future design changes.
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https://code.launchpad.net/~uriboni/webbrowser-app/newtabview-listviews/+merge/274986
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