@Override
		public void valueChanged(ListSelectionEvent e) {
			if (e.getValueIsAdjusting()) {
				return;
			}

			// reset state initially
			selectedInList = null;
			enableButtons(false);

			List<String> selectedValues = pluginPathsList.getSelectedValuesList();
			if (selectedValues.isEmpty()) {
				String path = pluginPathsList.getSelectedValue();
				if (path != null) {
					selectedValues = Collections.singletonList(path);
				}
			}

			removeButton.setEnabled(false);
			if (selectedValues != null) {
				int numSelected = selectedValues.size();
				selectedInList = new ArrayList<>(selectedValues);
				if (numSelected == 1) {
					// only if there are more than 1 paths in list
					// do we enable the UP and DOWN arrows
					if (listModel.size() > 1) {
						enableButtons(true);
					}
					else {
						removeButton.setEnabled(true);
					}
				}
				else if (numSelected > 0) {
					removeButton.setEnabled(true);
				}
			}
		}
ListCellRenderer that renders the path values in the list,
coloring paths that are no longer readable in red.
Ghidra/Framework/Project/src/main/java/ghidra/framework/main/EditPluginPathDialog.java