private MarkerSet getSelectionMarkers() {
		// already created
		if (p2SelectionMarkers != null) {
			return p2SelectionMarkers;
		}

		FieldPanel fp = diffListingPanel.getFieldPanel();
		p2SelectionMarkers =
			markerManager.createAreaMarker("Selection", "Selection Display", secondaryDiffProgram,
				MarkerService.SELECTION_PRIORITY, false, true, false, fp.getSelectionColor());
		return p2SelectionMarkers;
	}
Reload the marked differences in the diff panel.
Ghidra/Features/ProgramDiff/src/main/java/ghidra/app/plugin/core/diff/ProgramDiffPlugin.java