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Dolphin/Gwenview uses clickable urlbar. To enhance usability current location icon(icon in left edge/corner) of urlbar should display option like: previous view and up.

I don't know this can be simple to realize(urlbar must provide history to achieve this effect), but it can be great feature.

Gwenview don't contains navigation options. I know, that you would say it's an application bug. I think some application designed for small screen wouldn't contains this options.

(Up button is already implemented by two ways: I can click onto button on urlbar or click small > character near current location icon).

Why would we want this instead of just using toolbar buttons, especially since it takes more clicks this way?

Programs, such as Gwenview don't contains navigation buttons, due to reducing space usage.

Urlbar are great to navigating on directory tree, but not on history.

They don't by default but you can add them very easily. Just right-click on the toolbar->configure toolbars.