Draw a box with an optional title in the top border, in local coords. style applies only to the border glyphs themselves — a title's own text is drawn plain here (its emphasis, if any, is the widget's own concern, e.g. ListView#title_style) so it doesn't inherit the border's color.

Draw a box like #box, but with a T-junction character injected into the top and bottom border rows at local column divider_at — used by SplitWindow to merge its internal pane divider into the outer border. This is a degenerate single-divider stamp (draw a plain box, then overwrite one cell per row) rather than a composed Term.border_line call — it doesn't contain segment/junction math to unify, and rebuilding it in those terms would risk changing how a title long enough to reach divider_at currently gets partially overwritten by the injected junction glyph.

Draw a horizontal separator spanning w columns at (y, x). left_join / right_join use ├ / ┤ instead of └ / ┘.

Draws a vertical scrollbar in column x, h rows tall starting at y. fraction is the 0.0 (top) to 1.0 (bottom) position of the viewport, visible/total size the thumb proportionally. fraction nil means no scrollbar (content fits entirely, nothing to indicate). inset reserves that many rows off each end of h before drawing — the default of 1 matches the original use (a box's own top/bottom border rows straddle the track); pass inset: 0 to span the full h rows, e.g. a borderless field with no border rows to skip (see ScrollableField#render).

Write a string starting at local (row, col), 0-indexed. ANSI escape sequences in s are tracked as the running style and attached to each subsequent plain character's cell, rather than being written as their own cells — this lets the compositor diff on (char, style) per cell.

Draw a vertical line of h rows starting at (y, x), local coords.

Fixed size in cells, set at construction. A widget wanting a different size builds a new Buffer (see Widget#composite) rather than resizing this one in place.