Trackerlist plugin's exactvalue with field(.,.,.) expression does not work with item links

• Error
• Usability
• Patch
• Less than 30-minutes fix

TW5.0beta1
Tried a field($fieldid,user,$trackerid) expression, and it does not work if the $fieldid is of item link type.
Debug insight:
While field($fieldid,user,$trackerid) results in the unresolved itemid referencing to the item link domain, the

$items = $trklib->list_items($trackerId, $tr_offset, $max, $tr_sort_mode, $passfields, $filterfield, $filtervalue, $tr_status, $tr_initial, $exactvalue, $filter, $allfields);

call does not work. Namely, $trklib->list_items(..) works with the resolved item links. Therefore, there is no match.

(1) $trklib->list_items(..) shall use the itemid references instead of the real value in my opinion. However, this must have a big impact.

(2) We could resolve the link too when processing the field(..) exactvalue parameter. This way the strange behavior of $trklib->list_items(..) can be satisfied. To do so, we may add

$field = $trklib->get_tracker_field($matches[2]);
	if ($field['type'] == 'r') {
		$refItemId = $trklib->get_item_id($field['options_array'][0], $field['options_array'][1], $l);
		$l = $trklib->get_item_value($field['options_array'][0], $refItemId, $field['options_array'][3]);
	}

after the

$l = $trklib->get_item_value(0, $matches[4], $matches[2]);

line.

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