Hide navigation bar on scrolling and open url entry on new tab
These are combined patches that I developed while you were working on tabsmodel.
The added functionality:
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navigation bar is hidden while you scroll down and appears again as soon as you scroll up. Its also possible to hide/show the bar from context menu. When hidden, context menu is accessible via swipe to the right at the bottom of the screen
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tabs button shows number of tabs available in this mode (regular or private)
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on opening URL entry, bookmarks are shown first. They are also shown if the search string is empty. Otherwise, history is searched.
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on adding new tab, about:blank is used and URL entry is shown.
Should be ready to use, please review.