boolean isTooCloseY(double topY, double bottomY, double threshold) {
			double delta = goingDown ? topY - bottomY : bottomY - topY;
			return delta < threshold;
		}
Encapsulates knowledge of edge direction (up/down, left/right) and uses that knowledge
to report vertex offsets from the appropriate side and top/bottom
Ghidra/Features/FunctionGraphDecompilerExtension/src/main/java/ghidra/app/plugin/core/functiongraph/graph/layout/DecompilerNestedLayout.java