When Sudoku is launched from the command line, there are multiple warnings about anchoring that would need addressing:
$ qmlscene sudoku-app.qml
file:///home/dpm/dev/coreapps/sudoku-app/sudoku-app.qml:700:25: QML Label: Cannot anchor to an item that isn't a parent or sibling.
file:///home/dpm/dev/coreapps/sudoku-app/components/SudokuButtonsGrid.qml:45:5: QML SudokuButton: Cannot anchor to an item that isn't a parent or sibling.
[...]
file:///home/dpm/dev/coreapps/sudoku-app/components/SudokuBlocksGrid.qml:283:9: QML Grid: Cannot specify anchors for items inside Grid. Grid will not function.
file:///home/dpm/dev/coreapps/sudoku-app/sudoku-app.qml:392:17: QML Column: Cannot specify top, bottom, verticalCenter, fill or centerIn anchors for items inside Column. Column will not function.
Frederic, can you look into this. Although I think that we can ignore these warnings since they have no impact on the app at all.