"[DOM] Found 2 elements with non-unique id #frequency_select"

[fancycode]

Steps to reproduce

1. Open the edit view of a calendar event (using Calendar app 1.6.1 on NC 13).

Expected behaviour

No error should be logged to the browser console.

Actual behaviour

Chrome (67.0.3396.99) logs

[DOM] Found 2 elements with non-unique id #frequency_select: (More info: https://goo.gl/9p2vKq)
<select id=​"frequency_select" ng-options=​"repeat.val as repeat.displayname for repeat in repeat_options_simple" ng-model=​"properties.rrule.freq" class=​"ng-pristine ng-untouched ng-valid ng-not-empty">​…​</select>
<select id=​"frequency_select" ng-options=​"repeat.val as repeat.displayname for repeat in repeat_end" ng-model=​"selected_repeat_end" class=​"ng-pristine ng-untouched ng-valid ng-not-empty">​…​</select>​

The two locations are

calendar/templates/part.eventsrepeat.php

Line 34 in 4f1beb3

id="frequency_select"

calendar/templates/part.eventsrepeat.php

Line 56 in 4f1beb3

<select id="frequency_select"

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