$mdutil.findFocusTarget uses scope() which will not work if debug information is turned off

[geersch]

function scanForFocusable(target, selector) {
    var elFound, items = target[0].querySelectorAll(selector);

    // Find the last child element with the focus attribute
    if ( items && items.length ){
      var EXP_ATTR = /\s*\[?([\-a-z]*)\]?\s*/i;
      var matches = EXP_ATTR.exec(selector);
      var attribute = matches ? matches[1] : null;

      items.length && angular.forEach(items, function(it) {
        it = angular.element(it);

        // If the expression evaluates to FALSE, then it is not focusable target
        var focusExpression = it[0].getAttribute(attribute);
        var isFocusable = !focusExpression || !$mdUtil.validateScope(it) ? true :
                          (it.scope().$eval(focusExpression) !== false );

        if (isFocusable) elFound = it;
      });
    }
    return elFound;
  }

The scope() function is only available if debug information is available! Evaluating the expression assigned to the focus attribute will break as soon as this is turned off in production.

[Frank3K]

This isn't the first issue where scope() is used, see also e.g. #6033. Is this some that can be tested automatically using e.g. karma?