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I have run into this in ODCS Tasks, but seems to apply to Bugzilla too (at least). When opening a custom query via Edit or clicking Modify Query on query results, the editor for the query only has "Cancel Changes" button. After a while I realized that the changed query can be saved (and so re-run) by the standard IDE save action, but that is not very intuitive. It seems that an explicit Save button would do no harm and could help some users who could be confused. Perhaps the button could also express the fact that the query would not be just save but also refreshed (executed). Maybe "Save and Re-run" ?
See also bug 239699.
fixed in core-main #8008dea4fb60