What to do when a question is closed with a incorrect dupe target? [duplicate]

This question already has an answer here:

So there is this question: How to set Web Chrome Client & access GeoLocation in webview?

It is currently marked as a dupe of webChromeClient opens link in browser

But it should be a dupe of getting location in WebView via js
because it will help people more that visit that question to find the correct answer for the specific issue.

How should could the duple target be exchanged for something more useful for future visitors? Do I need to mod flag it? Reopen, flag then close with correct dupe(seems cumbersome and error prone)? ask here to come in contact with gold badge holders? Ask in a chat room?

I tried looking for a pre-existing question but all I found were answers to OP’s who wanted something with their own question.