Fix Query Builder FilterEditor on Alert Rules page #838
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Fixes #828
Dropdown wasn't working because
filter.operator
was marked as readonly. I assume there's some magic going on within Grafana to where this code is interpreted differently on this page compared to the regular explore/dashboard view.It is a valid problem though, the current state was being mutated to generate the next state. Fixed by copying the filter and then modifying. Dropdown now works as expected on Alert Rules page.