public ColumnSegment<E> getColumnSegment(E edge, GridPoint gridPoint) {
		ColSegmentList<E> colSegments = colSegmentMap.get(gridPoint.col);
		return colSegments == null ? null : colSegments.getSegment(edge, gridPoint);
	}
Finds the column segment object for the given edge and start point.
@param edge the edge for which to find its column segment object
@param gridPoint the start point for the desired segment object
@return the column segment object for the given edge and start point.
Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/layout/flowchart/EdgeSegmentMap.java