I believe Jon mentioned the Feed Reader is a work in progress and time / staff permitting he wants to see it improved.
Mail has seen improvements...
Let us wait and see what happens. I think it will be for the better.
Here's my current workaround for this:
I double click the message whose video I want to follow in PiP to open it in a new tab
On the new tab, I play the video and activate PiP.
I go back to my inbox and keep going through the rest of the feeds and messages
As long as the feed item is open in that separate tab, the PiP will keep running as expected...
@mossman , that Big Tech boasts new achievements, that a small company has already had for some time.
I think that Chrome had many more relevant functions, when Google would focus more on the needs of the user, than on the commercial interest itself and on the user only as merchandise.
Can you imagine Vivaldi with the resources that Google has at his disposal?
If you want to delete everything (including emails stored in M3), you can follow this procedure:
Go to vivaldi://inspect#apps
Click on Inspect below the first App on the list, chrome-extension://…/browser.html
Go to the “Application” tab
Open Storage -> IndexedDB -> M3v1, click on “Delete Database”
Close the Devtools window
Open vivaldi://about, copy the file path to your profile and open it in your file explorer
Delete the folder Mail
Open the file “Preferences” with a code editor which manage JSON
Pretty JSON, for example VS Code or Sublime Text
Remove everything inside Vivaldi -> RSS -> settings and save the file.
All your RSS feeds, accounts, messages and mails are now removed and you can start over a nice and clean session.
Please tell me if you have any trouble, I can make a video of the whole procedure with explanations if it help.
I've also had the same issue.
Edit: Now that I've posted this, I stopped having this issue. Though this may be because I'm Ctrl+A read messages instead of unread
Edit: Edit: When I Select All then mark as read, some messages remain highlighted but not all. All messages are mark as read though.
@mossman So I've just spent about an hour carefully re-doing all my feeds:
copied the address of each feed to a new tab and saved those tabs as a session
deleted feeds from the mail view by right-click (this seemed easier and more reliable than the through the settings)
closed and re-opened Vivaldi
deleted one of the feeds which had reappeared
closed and opened again
opened the first tab in alphabetical order and clicked to subscribe (leaving title and refresh time at default)
close the tab and repeat for each feed
There was another case of a feed not subscribing properly - didn't appear in the mail view, was in settings but couldn't be deleted, RSS page wouldn't load any more. So I had to go back and start over.
I'm wondering if this now (apparently) cleaned-up database will show less bugs than before... Here's hoping.
Oh, I've got that for two feeds, one Youtube feed (https://www.youtube.com/feeds/videos.xml?user=legourmettv) and one from a national radio station (https://www.deutschlandfunk.de/sternzeit.731.de.rss). At some point M3 created the duplicate feed entry, and new articles will appear in the more recent of the two.
Thanks everyone! I also confirm that neither disabling nor disabling/re-enabling the mail client resolved the issue. I've gone ahead and submitted bug VB-76454 for my issue. I didn't attempt to replicate the issue @derDay saw, so you may want to submit a seperate bug for not being able to delete the feed if you haven't already.