src/vs/workbench/contrib/notebook/browser/viewParts/notebookKernelActionViewItem.ts/NotebooKernelActionViewItem/_updateActionsFromSourceActions
class NotebooKernelActionViewItem:	private _updateActionsFromSourceActions() {
		this._action.enabled = true;
		const sourceActions = this._notebookKernelService.getSourceActions();
		if (sourceActions.length === 1) {
			// exact one action
			this._updateActionFromSourceAction(sourceActions[0], false);
		} else {
			this._action.class = ThemeIcon.asClassName(selectKernelIcon);
			this._action.label = localize('select', "Select Kernel");
			this._action.tooltip = '';
		}
	}