Remove 'magnified' class only from the current row when locking.
No longer set transition properties dynamically.
Rename: move_focus() -> move_masks().
Rename select_row() to focus_row().
Fix referencing a wrong variable.
Separate selecting a row from magnifying a row.
Add a parameter 'nomag' for disabling magnification.
Remove an unnecessary initial unlocking.
Adjust the positions of row numbers.
Refactoring.
Put cursor buttons nearer a row number in the case of 'nomag' mode.