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scroll): pane.hscroll cuts content columns after the lineno gutter in bodyText (post edit-splice, so typed runs shift with the text), no scrollbar. Drivers: horizontal wheel (new wheel_left/right Mouse.Buttons, SGR 66/67 via vaxis on the tty, SDL wheel.x on the gui, ±4 cols, clamped at 0, right overscroll allowed) and keyboard movement — ensureCursorVisible grew the horizontal mirror of the scrolloff reconcile, so $ pulls the view right with 3 columns of margin and 0 reels it home; the wheel never moves the cursor. Shifted alongside: syntax recolor pass, modal cursor paint (hidden when off-view), vsel highlight, click->content-col mapping, cursorWordSel. Byte columns like the rest of the file-pane code. New hscroll.snap golden: wheel shift with fixed gutter, left clamp, $ margin follow, 0 home. 30/30.
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