I came across the following question: Graphical/Browser-Based PHP Unit Testing Suite?
The question is definitely a duplicate, as stated in its comment, but I overlooked that link when first seeing the question, and jumped right to the answers. The accepted answer wasn't much help to me, but I found an okay solution through another answer, but only after some more searching.
That being what happened, I would've had to spent much less time searching if I had actually noticed the "duplicate" link in the comment. And this leads me to my question: How would one highlight another (possibly duplicate) question, that has much higher quality information on the topic than the current one, especially on questions that have been inactive for some time?
My first idea was to add something like the following to the original question:
[Example] Additional information can be found here.
But then I wondered if it was okay to modify a question like that (which is why I am asking here now).
While I understand that I could add an answer, answers containing only a link are very often downvoted on Stackoverflow (often justifiably so), and downvoted answers are not likely to receive much attention.
I could also create another comment, but comments are very often entirely overlooked, as was the case with the comment that was already there.
Another solution to highlight a question as a duplicate is to close it as a duplicate (duh), but that takes a bunch of people voting to close it (which I did), and that rarely happens on old question (at least that is my impression).
One could think of a mechanism that displays "possible duplicate" close suggestions more prominently than in a comment, like so:
Doing nothing and telling me to look at the comments next time would be fine too I guess (I'll probably do that in the future anyway), but as I think that it should be as easy as possible to find high quality information on Stackoverflow, I figured that we as a community could come up with a better solution than that.