Function used to filter errors displayed in the Event Log. This Function will first check if errors are currently filtered. Then, regardless if true or false, will evaluate if a project filter is active or not. Depending on the combination of error and project filters, the filtered list will be updated. One of three possibilities could happen: 1. Restarting from the original event log list (if
source not stored for this graph (policy: none)
nothing calls this directly
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