src/vs/workbench/services/keybinding/common/macLinuxKeyboardMapper.ts/MacLinuxKeyboardMapper/_leftPad
class MacLinuxKeyboardMapper:	private _leftPad(str: string | null, cnt: number): string {
		if (str === null) {
			str = 'null';
		}
		while (str.length < cnt) {
			str = ' ' + str;
		}
		return str;
	}