Multilevel mailbox structure

[dehnhardt]

• (Soft) requires Bump @nextcloud/vue from 1.5.0 to 2.6.0 #3466
• Logic for addAccount
• Logic for addMailbox
• Edge case: removal of a mailbox that has children -> children should be promoted by one level (if IMAP even allow this operation) -> problematic on IMAP level as well, so we're hiding the delete action for mailboxes with children.
• Detect and persist personal namespace (related to Add a setting for personal namespaces #3272, but fully automated)

Fixes #794

Signed-off-by: Holger Dehnhardt holger@dehnhardt.org
With this pr it is possible to display a folder structure of any depth.
The structure is only created using the getter in the frontend.
Creating new folders within the structure works - but is not tested carefully.
There are some problems with the display.

• Replacing the folder icons with the arrows does not work properly
  

• the navigation area quickly becomes too narrow.
  See comments inside the changes...
  

To make the goal of this PR clearer, this picture shows how the structure is presented so far:

[ChristophWurst]

I'm currently focusing on #2125 but I'll look into this soon.

[dehnhardt]

I'm currently focusing on #2125 but I'll look into this soon.

I've seen that. Take your time ;-)

[dehnhardt]

@ChristophWurst: Now that nextcloud-libraries/nextcloud-vue#1140 has come to the mails masterbranch, wouldn't it be wonderful to have this in master as well ;-)
Rebased and squashed.

[ChristophWurst]

Sure, let's do this :) This requires a few adaptations for #3439 but I can help with that if you like.

[ChristophWurst]

I took the liberty to just rebase the branch, resolve the conflicts and fix some unused code (leftover from previous rebase possibly).

The patch looks clean, but I'm unsure if your attended changes are still here. Could you please check and give me a quick update? We can always reset to an older state if I accidentally dropped some important changes 🙏

[dehnhardt]

To be honest, I can no longer tell which changes were originally mine and which are yours.
But I checked out and tested the branch on my test system and it seems to work how it should.
I just wonder why the indentation is still so big. Is the current Nextcloud vue version not merged yet?

[ChristophWurst]

To be honest, I can no longer tell which changes were originally mine and which are yours.
But I checked out and tested the branch on my test system and it seems to work how it should.

No worries. I spent some time on this yesterday and also added some unit tests.

I just wonder why the indentation is still so big. Is the current Nextcloud vue version not merged yet?

It's not, hence the TODO in the PR description.

[GretaD]

tested and works