String getTextForSelection() {
		FieldSelection selection = getSelection();
		if (selection == null) {
			return null;
		}

		return FieldSelectionHelper.getAllSelectedText(selection, this);
	}
Translates a screen/view selection into a byte block model selection
@param fieldSelection a {@link FieldPanel} selection
@return a {@link ByteBlockSelection}
Ghidra/Features/ByteViewer/src/main/java/ghidra/app/plugin/core/byteviewer/ByteViewerComponent.java