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performance(terminal): improvements to reflow performance by removing…
… O(n^2) behavior (zellij-org#3045) * refactor: Simplify transfer_rows_from_viewport_to_lines_above next_lines is always consolidated to a single Row, which immediately gets removed - we can remove some dead code as a result * perf: Batch remove rows from the viewport for performance Given a 1MB line catted into the terminal, a toggle-fullscreen + toggle-fullscreen + close-pane + `run true` goes from ~9s to ~3s * perf: Optimize Row::drain_until by splitting chars in one step Given a 10MB line catted into the terminal, a toggle-fullscreen + toggle-fullscreen + close-pane + `run true` goes from ~23s to ~20s
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