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6c8966f426
This works around a bug where the optimized version of the `Grid::scroll_down` function would just rotate the entire grid down if the scrolling region starts at the top of the screen, even if there is history available. Since rotations of scrolling regions should not affect the scrollback history, this optimized version is now only called when the max scrollback size is 0, making it impossible for the grid to have any history while it is used. Since the main usecase of this is the alternate screen buffer, which never has any history, the performance should not be affected negatively by this change. Fixes #3582. |
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