// Listen for new groups
this._register(this.editorGroupsService.onDidAddGroup(group => {
  this.registerGroupListeners(group);
}));

// Listen to all editor groups
this.editorGroupsService.groups.forEach(group => {
	this.groupDisposables.set(group.id, this.registerGroupListeners(group));
});

// Listen for new groups
this._register(this.editorGroupsService.onDidAddGroup(group => {
	this.groupDisposables.set(group.id, this.registerGroupListeners(group));
}));

// listen for groups to be removed
this.editorGroupsService.onDidRemoveGroup(group => {
	this.groupDisposables.deleteAndDispose(group.id); // remove listener
});