More Space at the edges

[jonakieling]

If in zoomed-in state, there should be more space between the Sudoku and the border of the screen.

[HeikoKlare]

That is pretty difficult because the buttons are placed when creating the sudoku according to the space for the sudoku itself. We would have to move the buttons in addition to scaling them while zooming. Even scaling is not easy as the zooming-stotters show.
Imo we should look for a better way to present the sudoku than using a relative layout with manually placing and scaling the buttons.