Fix rebase

packages/widgets/src/tabbar.ts

@@ -1070,24 +1070,6 @@ export class TabBar<T> extends Widget {
  detachRequested: false
  };
 
- // Add the document pointer up listener.
- this.document.addEventListener('pointerup', this, true);
-
- // Do nothing else if the middle button or add button is clicked.
- if (event.button === 1 || addButtonClicked) {
- return;
- }
- if (scrollBeforeButtonClicked || scrollAfterButtonClicked) {
- this.beginScrolling(scrollBeforeButtonClicked ? '-' : '+');
- return;
- }
-
- // Do nothing else if the close icon is clicked.
- let icon = tabs[index].querySelector(this.renderer.closeIconSelector);
- if (icon && icon.contains(event.target as HTMLElement)) {
- return;
- }
-
  // Add the extra listeners if the tabs are movable.
  if (this.tabsMovable) {
  this.document.addEventListener('pointermove', this, true);