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In the existing layout sidebar buttons (new game, pause, clear board and high scores) were taking big amount of screen space. When window had a vertical aspect ratio more space was wasted above and below the minefield. The loss of space was especially painfull on a smartphone screen. This commit introduces changes in layout to minimize the loss of screen space: - new game, pause and clear board buttons were moved to the headerbar - high scores button was removed (the action remains available in the primary menu) - clock and mines counter may be moved below the minefield if the window has vertical aspect ratio Semi-related changes: - primary menu definition was moved from vala to interface.ui - minimum tile size was increased to 30
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