By default the 'all posts' page contains the following filters
- by date
- by category
Is there a way I can add 'by tags' as well ?
With absolutely no help whatsoever from this community and it's ridiculous reputation rules, I have worked out how to amend the above code so that it works properly.
The following code needs to go into wp-includes/functions.php. Notice that I have hardcoded the select name to be tag, which appears to be how the WP filter query string works now.
Then the action needs to go into your theme functions.php file (wp-content/themes/YOURTHEME/functions.php
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