private MarkerSet getDiffMarkers() {
		// already created
		if (p2DiffMarkers != null) {
			return p2DiffMarkers;
		}

		p2DiffMarkers =
			markerManager.createAreaMarker("Difference", "Diff Display", secondaryDiffProgram,
				MarkerService.DIFF_PRIORITY, false, true, true, diffHighlightColor);
		return p2DiffMarkers;
	}
Reload the marked differences in the diff panel.
Ghidra/Features/ProgramDiff/src/main/java/ghidra/app/plugin/core/diff/ProgramDiffPlugin.java