A click in the left margin beside body text selects that line (trailing
space, and the paragraph mark on a paragraph's last line), a double-click
the paragraph, a triple-click or Ctrl/Cmd+click the document; dragging
there selects whole lines and Shift+click extends by lines. The pointer
shows the arrow there. Layout gains selection_bar_at, body_line_at and
line_span; select.line takes an optional pos; select.dragUnit takes the
units line and document.
Co-authored-by: Dmitrii Khlapov <19991457+dkhlapov@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
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