@Override
 public Insets getBorderInsets(final Component c) {
   if (myProject == null) return new Insets(0, 0, 0, 0);
   ToolWindowManager toolWindowManager = ToolWindowManager.getInstance(myProject);
   if (!(toolWindowManager instanceof ToolWindowManagerImpl)
       || !((ToolWindowManagerImpl) toolWindowManager).isToolWindowRegistered(myInfo.getId())
       || myWindow.getType() == ToolWindowType.FLOATING) {
     return new Insets(0, 0, 0, 0);
   }
   ToolWindowAnchor anchor = myWindow.getAnchor();
   Component component = myWindow.getComponent();
   Container parent = component.getParent();
   while (parent != null) {
     if (parent instanceof Splitter) {
       Splitter splitter = (Splitter) parent;
       boolean isFirst = splitter.getFirstComponent() == component;
       boolean isVertical = splitter.isVertical();
       return new Insets(
           0,
           anchor == ToolWindowAnchor.RIGHT || (!isVertical && !isFirst) ? 1 : 0,
           (isVertical && isFirst) ? 1 : 0,
           anchor == ToolWindowAnchor.LEFT || (!isVertical && isFirst) ? 1 : 0);
     }
     component = parent;
     parent = component.getParent();
   }
   return new Insets(
       0,
       anchor == ToolWindowAnchor.RIGHT ? 1 : 0,
       anchor == ToolWindowAnchor.TOP ? 1 : 0,
       anchor == ToolWindowAnchor.LEFT ? 1 : 0);
 }
  private void updateTabBorder() {
    if (!myProject.isOpen()) return;

    ToolWindowManagerEx mgr = (ToolWindowManagerEx) ToolWindowManager.getInstance(myProject);

    String[] ids = mgr.getToolWindowIds();

    Insets border = new Insets(0, 0, 0, 0);

    UISettings uiSettings = UISettings.getInstance();

    List<String> topIds = mgr.getIdsOn(ToolWindowAnchor.TOP);
    List<String> bottom = mgr.getIdsOn(ToolWindowAnchor.BOTTOM);
    List<String> rightIds = mgr.getIdsOn(ToolWindowAnchor.RIGHT);
    List<String> leftIds = mgr.getIdsOn(ToolWindowAnchor.LEFT);

    if (!uiSettings.HIDE_TOOL_STRIPES) {
      border.top = topIds.size() > 0 ? 1 : 0;
      border.bottom = bottom.size() > 0 ? 1 : 0;
      border.left = leftIds.size() > 0 ? 1 : 0;
      border.right = rightIds.size() > 0 ? 1 : 0;
    }

    for (String each : ids) {
      ToolWindow eachWnd = mgr.getToolWindow(each);
      if (!eachWnd.isAvailable()) continue;

      if (eachWnd.isVisible() && eachWnd.getType() == ToolWindowType.DOCKED) {
        ToolWindowAnchor eachAnchor = eachWnd.getAnchor();
        if (eachAnchor == ToolWindowAnchor.TOP) {
          border.top = 0;
        } else if (eachAnchor == ToolWindowAnchor.BOTTOM) {
          border.bottom = 0;
        } else if (eachAnchor == ToolWindowAnchor.LEFT) {
          border.left = 0;
        } else if (eachAnchor == ToolWindowAnchor.RIGHT) {
          border.right = 0;
        }
      }
    }

    myTabs
        .getPresentation()
        .setPaintBorder(border.top, border.left, border.right, border.bottom)
        .setTabSidePaintBorder(5);
  }