Update pagination logic when searching to add videos to a playlist

[ChunkyProgrammer]

The old logic would filter the results and use the count of the filtered results to determine if a next page should be shown. If there were playlists or channels then the next page button would not be shown even if there was a next page.

[SamantazFox]

That's much simpler than what I had in mind ^^ (which involved returning the continuation token from very far in the call stack)

[SamantazFox]

Still doesn't work.

That's probably because we skip the categories (e.g "Latest (shorts) from [channel]" and "People also watched").
I'd bet it's caused by "Latest posts from [channel]", as this type of search result are not supported yet.

Here I tested searching for linus tech tips on the test instance, and there is no button:

[ChunkyProgrammer]

@SamantazFox yeah, looks like this PR isnt working because #4583 is no longer working

[ChunkyProgrammer]

Also, I think you're using the search page in the screenshot (which was not modified by this code, I only modified the screen where you search videos to add to a playlist /add_playlist_items?q=SEARCH_QUERY)

[SamantazFox]

Also, I think you're using the search page in the screenshot (which was not modified by this code, I only modified the screen where you search videos to add to a playlist /add_playlist_items?q=SEARCH_QUERY)

You're right .-.