Disable loading all tabs at once, since there can be many of them, and use default strategy of only keeping in memory the two tabs adjacent to the current tab.
The fix just involves removing some really outdated code (6 years ago) added in 33e29be7db (diff-38bd2cf1b92659b499c08e1cf6ac9ef384c7e13381b906f2f98c57cbb758756dR778) (blame: 9318bb5306/app/src/main/java/org/schabi/newpipe/detail/VideoItemDetailActivity.java (L778)).
What that code did was setting the 'buddy' image to the uploader avatar as a placeholder, and then setting the actual image if it existed and after it had loaded.
That code remained there up until now, but now it doesn't make sense anymore, since Picasso already takes care of setting placeholders.
The problem is, starting from #10066 the actual uploader image is set before (not after) those lines of code, making them do the wrong thing, i.e. always overwrite the currently set image.
But then why did the channel avatar image work normally sometimes?
My guess is that since Picasso loads images in the background, when opening a video from scratch setting the placeholder still happened before Picasso finished loading the image.
However when the image is already cached it's loaded much faster and therefore setting the placeholder happens after, effectively hiding the loaded image.
imageListToDbUrl should be used if the URL is going to be saved to the database, to avoid saving nothing in case at the moment of saving the user preference is to not show images.
Add the separate utility class PlayButtonHelper to handle the initialization of the listeners.
The ClickListeners on playlist controls had different behaviours. This commit fixes that.
The commit also refactors the way how the app determines whether it is started for the first time. The previous version was not clean and recent in this PR caused it to fail.
The previous "main" tab is now just a normal tab returned in getTabs().
Various part of the code that used to handle channels as ListInfo now either take the first (playable, i.e. with streams) tab (e.g. the ChannelTabPlayQueue), or take all of them combined (e.g. the feed).
