`mu4e`: multiple marks/actions at once

I would like to execute multiple marks/actions at once. For example, marking messages as `read` and `flag` them at the same time; or marking messages as `unflag` and trash them at the same time. I'm hoping that's possible somehow, but I haven't been able to figure out how. Any suggestions?

I don’t know if this answers your question. When I go through my inbox, I hit d for each mail I want to delete. When I’m done, I press x to execute the deletion operation.

It doesn't, unfortunately. I do the same thing, but depending on the mailserver's behaviour (e.g. Google Mail), this results in these mails being moved to the 'Bin', but still flagged as `unread` and thus still showing up as `unread` messaged. This is why I would like to mark them for `read` and `trash` at the same time. Similarly, I often want to delete messaged while also marking them as `unflagged`. If I don't remove their flag, these messages will remain in Gmail's 'starred' section. Another common use case is `+read` and `+flagged`, but I won't go into detail ... Doing these things in two steps is inconvenient because I have to mark each mail twice, plus, for example, read messages are immediately removed from my 'todo' search, which is based on `flag:unread or flag:flagged`.

I don't know if this is an official keybinding since I use evil, but I mark multiple headlines `read` with "!" and execute at once with "x".

I'm not aware of a way to do this directly, but as a substitute you can create a new mark if you do this often. https://www.djcbsoftware.nl/code/mu/mu4e/Adding-a-new-kind-of-mark.html

That's not what I mean, see my comment above. I want to mark several mails as `read` **and** `flagged` at the same time.

Yeah, I was thinking that might be the way to go at some point. However, in practice, I don't know how to define a new mark/action that, for example, applies `read` and `flagged` at the same time. I think it's just my lack of elisp-fu. Could you or anyone else help with this? Didn't find useful examples online.