Optimize Row::reset

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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.

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This commit is contained in:

Joe Wilm 2018-05-19 11:18:37 -07:00

parent 4b1a3b1e92

commit c61a912f62

24 changed files with 145 additions and 104 deletions

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tests/ref/vttest_cursor_movement_1/grid.json

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