Resolve "Duplicate todo is created for already mentioned user"
requested to merge 393910-duplicate-todo-is-created-for-already-mentioned-user-15.9 into 15-9-stable-ee
What does this MR do and why?
This is the back port to 15.9 of Resolve "Duplicate todo is created for already ... (!113796 - merged)
This bug is effecting customers, as shown in comment !113796 (comment 1308550930), so it's appropriate to back port this fix.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Related to #393910 (closed)
Edited by Brett Walker