src/vs/workbench/browser/actions/navigationActions.ts/BaseNavigationAction/navigateBackToEditorGroup
class BaseNavigationAction:	private navigateBackToEditorGroup(direction: GroupDirection): boolean {
		if (!this.editorGroupService.activeGroup) {
			return false;
		}

		const oppositeDirection = this.toOppositeDirection(direction);

		// Check to see if there is a group in between the last active group and the direction of movement
		const groupInBetween = this.editorGroupService.findGroup({ direction: oppositeDirection }, this.editorGroupService.activeGroup);
		if (!groupInBetween) {
			// No group in between means we can return focus to the last active editor group
			this.editorGroupService.activeGroup.focus();
			return true;
		}

		return false;
	}