It would seem that the optimal solution to both maintain readability and not waste screen space would be to start counting the characters from after the indentation.
Since indentation is stepped, you won't (often) be jumping massive horizontal distances.
If the government want to help (and the new government has shown a strange attraction to price interference), they could simply let schools choose their own holidays, as long as they have the right number of school days in the year.
It would be a bit harder for families with kids in different schools, but probably most schools would be _more or less_ the same, with just a bit more variation to spread it around a little bit.
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