void (EditorEx editor, Runnable handler) { ErrorStripeEditorCustomization.DISABLED.customize(editor); // TODO: copied from ExpandableTextField JScrollPane pane = editor.getScrollPane(); pane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); pane.getVerticalScrollBar().add(JBScrollBar.LEADING, new JLabel(AllIcons.General.CollapseComponent) {{ setToolTipText(KeymapUtil.createTooltipText(IdeBundle.message("action.collapse"), "CollapseExpandableComponent")); setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR)); setBorder(JBUI.Borders.empty(5, 0, 5, 5)); addMouseListener(new MouseAdapter() { @Override public void mouseEntered(MouseEvent event) { setIcon(AllIcons.General.CollapseComponentHover); } @Override public void mouseExited(MouseEvent event) { setIcon(AllIcons.General.CollapseComponent); } @Override public void mouseClicked(MouseEvent event) { handler.run(); } }); }}); }