Multiple select in all lists in the app

[Stypox]

Checklist

• I made sure that there are no existing issues - open or closed - which I could contribute my information to.
• I have read the FAQ and my problem isn't listed.
• I'm aware that this is a request for NewPipe itself and that requests for adding a new service need to be made at NewPipeExtractor.
• I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.

Feature description

Sometimes a user may want to perform the same action on multiple items in a list (e.g. a playlist, the history screen, the list of recommended videos, ...). At the moment, the user has to long-click on every item, and perform the same action from the long press menu. However, it would be faster if NewPipe allowed to first select multiple items, and then perform an action on all of them.

In case this feature is implemented, it would make sense to also add a button that allows selecting the whole list, as this would solve issues such as #5482.

This feature request is quite niche and should be considered carefully before being implemented, because it likely requires heavy changes in various places in the app, and it's not necessarily so useful for many users.

_{Note: this issue was created to combine #11490, #8584, #7231 and #3444 which are basically the same issue just for different screens}

Related discussion: #2583

[GfEW]

I'm puzzled as to why a feature as ubiquitous as multi-selection of list items could be regarded as niche request. That part I doubt, because:

1. "multi-select, then act on the selection" is a well established UI paradigm, and even "long-press to start selecting" got adopted by mobile mainstream ages ago;
2. the number of users asking for multi selection in one media listing or another, or positively responding to issues doing so, does not indicate a particularly niche request,
   2.1 neither with respect to the general userbase being a vast multiple of the nerdy fraction that communicates via github,
   2.2 nor when compared to other NewPipe FRs that are not labeled niche.

That being said, great to see this long standing usability flaw get some dev attention, after all!

[codyit]

Adding one more reason for it to be not niche, folks actually want this, as it came up in long press action behavior change discussion #11696 (comment) It's just that it's not easy for them to associate what they want to this mechanism.

[christian-reiser]

would love to use it

[absurdlylongusername]

I've removed the niche tag from this since this a widely requested feature that is also on my TODO list of priority things to implement, as well as also being mentioned in this discussion #12674.

Many apps already have this and is basic UX we should expect to include in NewPipe if we want it to be excellent.