Error deleting emails in Opera
From the very update of the plugin to version 24.0.4 in Opera, not always, but sometimes if I delete an e-mail, an error pops up, the screenshot of which I insert. Then the mail in the inbox is marked as unread, not deleted (probably because I opened it first). In Opera, I didn't change anything in opera://flags/
Comments
This has been an elusive issue because it was hard to replicate it, have you tried this https://jasonsavard.com/wiki/Conversation_View_issue
Most likely this is related to a sync issue as you stated, if there were easy steps to reproduce it I could try finding a resolution. I'm assuming I would just catch the error and ignore it as the email is probably dealt with previously.
"I'm assuming I would just catch the error and ignore it as the email is probably dealt with previously."
No, the mail was not opened directly in Gmail or deleted before. Only I have access to these mailboxes. And I open emails and then delete/leave them marked as read from your plugin because I just don't want to open several mailboxes in separate tabs or switch between them. So yes, for some reason this plugin sometimes (not always, sometimes) can't delete an email. I just don't know why.
I'm not sure, but it seems to me(!) that this error never affected the first email in the added list. I guess it can only appear in subsequent boxes.
I have added 5 accounts to the plugin. And this error most likely(!) concerns the last two. For the test, I moved even the penultimate account to the first place and the error did not occur.
However, the order of the accounts is a misleading clue. I reversed the order of the accounts and this time the error occurred on the second account (which was usually second to last). Unless in the plugin files they have a separate permanent ID (e.g. assigned according to the order of addition).
The original order ids should not be maintained, but you could test this theory by readding all the accounts in the order you want.