• Joe Wilm's avatar
    Optimize Row::reset · c61a912f
    Joe Wilm authored
    Now, only cells that have been used are cleared. This is achieved by
    using a "occupied" memo on the Row itself. The value, `occ`, is updated
    wherever the Row is accessed mutably, and it's cleared to zero in
    Row::reset.
    
    The tests for grid scroll_up and scroll_down were updated to include a
    test on the value `occ` and slightly refactored, but are otherwise
    equivalent to the previous implementation of those tests.
    
    Because of the change to the `Row` struct, the ref tests were updated so
    Deserialization keeps working as expected.
    c61a912f
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