Add ability for OP to "confirm" their question as a duplicate
96966
Grant the OP a binding close as duplicate vote
147652
Get a notification when new answers are added to other people's question
3666
Show OPs if someone is answering, live
107015
Make it clearer when looking at a question if I've already voted to close it
64859
Is it acceptable to add a duplicate answer to several questions?
106952
"Please ask a new question" encourages question repetition for duplicates
113886
Allow grouping of favorite questions
39016
Inform new users if they can upvote an answer they accepted
134797
Refresh "Questions that may already have your answer" after adding tags based on these tags
27856
Add the duplicate suggestion feature to mobile theme
76054
Add a message when posting to old questions with more than N answers
69992
Could we have the ability to mark a change as minor in questions or answers?
25851
New UI encourages askers to confirm or dispute duplicate votes
34508
Notify us when the question has been edited after posting an answer
83537
Add an answer to the question with many existing answers already
106883
Auto-flag duplicates of deleted questions for reopening / deletion
13367
Best way to deal with questions answered by the OP in the question instead of in an answer