drawColumnHandle
open fun DrawScope.drawColumnHandle(edge: KiteSelectionHandleEdge, y: Float, left: Float, right: Float, color: Color)(source)
Draws the marker for a boundary in vertical text, where a line is a column running down the page: y is the boundary's position down the column, and left/right the column's extent, in page-slot pixels. The default turns drawHandle a quarter turn clockwise, so a marker drawn below a line sits to the left of a column.