How to fix: WordPress not opening on localhost:8080 after port change from 80 to 8080 (HTTP 404 Not Found error)

Opening a WordPress site after Apache port change returns HTTP 404 error (Not Found). This is a common issue with WordPress users who have installed WordPress on local machine, then had to change the Apache HTTP port since other programs took over the HTTP port 80.

Here is a scenario for the issue:

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