fix: correct selection overflow during auto-scroll#86
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The auto-scroll selection handler was using viewportY directly as the absolute row position, but the coordinate systems are different: - viewportY = how far scrolled into history (0 = at bottom) - absoluteRow = index into combined buffer (0 = oldest scrollback) This caused selections to jump to very old scrollback lines when auto-scrolling upward. Fixed by using viewportRowToAbsolute() helper which correctly converts viewport coordinates to absolute buffer rows.
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fixes an issue where highlighting and scrolling back would cause way more output to get highlighted than intended