Show the hostname of the ownCloud server
Shows the domain of the user's username and the server's hostname
Example:
If user is called [email protected] and the hostname of the server is owncloud.domain.com, it will show domain.[email protected]

Client version: 2.4.3
Operating system: Ubuntu and Windows
Qt version used by client package (Linux only, see also Settings dialog): 5.6.2
Client package (From ownCloud or distro) (Linux only): ownCloud
Maybe having a '@' in the account display name is not such a good idea as many user think that '@' is for email address.
Perhaps we should show something like cloud.domain.com (username) instead of [email protected] everywhere we currently show the account name.
@michaelstingl : what do you think?
(Note to self: some code in activityitemdelegate.cpp and activitywidget.cpp relies on the '@')
Problem is, client hides a part of the username.
User: [email protected]
Host: example.de
Client displays: [email protected]
Correct would be: [email protected]@example.de
I don't really have a problem with [email protected]@example.de. I think this is what we call _Federation ID_. @pmaier1 Is there any convention how we display user+host?
We could also discuss using cloud.domain.com (username), but it seems the right column has fixed width and will probably hide most parts.

We also use username@host on other places, so we would have to change it there as well:
(from https://github.com/owncloud/client/pull/6113#issuecomment-338626327 )
I don't really have a problem with [email protected]@example.de
+1
There's a bug somewhere, we're cutting away too much if there is an '@'
Ah ok, i misunderstood the problem.
Fix in https://github.com/owncloud/client/pull/6731
@ogoffart strange, just tested with ownCloud-qt5.10.1-2.5.0.10453-daily20180827.pkg, and no username is visible at all in the activity tab. Only the hostname is shown:

@michaelstingl I don't see what's wrong in the screenshot.
I think the was never supposed to be there. (The code explicitly removes the username since it shows the account, in commit 3bccfb89934d13c9391275e99aa5dcb246439f0b )
If one should show the user name, then that can be changed.
Sorry for the confusion. I proposed to display the full _Federation ID_.
Correct would be:
[email protected]@example.de
At the moment, I can't distinguish 2 accounts on the same server:

Ah Ok. The original issue was about the fact that the removal of the username was not working properly if the username contained a '@'.
But if we do not want to remove the username, that can also be done.
Edit: In PR https://github.com/owncloud/client/pull/6763
Is my memory mistaken when I believe that this used to show in which share/folder the change was made? As of 2.5.0 it looks like it just shows the share owner's ID for some reason. If this is not related, please let me know and I'll look elsewhere for a solution. Thanks.

So to summarize: Since the time the activity tab was created, it normally did not have the user name. But there was a bug (reported by this bug report), which made that some part of the user name would show there if the username had a '@'.
That bug was fixed with PR #6731 , but it was asked later to actually put the user in there, so it was quickly amended with PR #6763, which is now the state in 2.5.0
(I believe that this number is indeed is indeed part of the Federation ID that, was asked for)
It would be possible to change the dav user with the dav display name (which would typically be the full name)
Note that there are many location that we show the account name, and they currently most use this dav_user@hostname format (via the Account::displayName function)
I believe we should keep everything the same.
@michaelstingl : what should be placed there?
Personally, i'd put cloud.domain.com (User Name) (where User Name is the dav display name (most likely the full name of the user)
Thanks for the summary. In my case, I can't see what the full ID is because there is no column scroll or resize. We use LDAP and those ID's are what appear in the "Username" field. I didn't realize there had never been an ID in that client column before. Thanks again for explaining.
I can't see what the full ID is because there is no column scroll or resize.
Yeah, I get your point.
I think we'd need proper columns and headers, with the option to resize column width etc. Probably option to filter by account too… All tabs in the Activity view should work similar. As a temporary solution, we could go back to the previous implementation, and build it better for one of the next releases…
Personally, i'd put cloud.domain.com (User Name) (where User Name is the dav display name (most likely the full name of the user)
I like this idea.
because there is no column scroll or resize.
Maybe this can be quickly enabled too @ogoffart ?
Then at a later point (not a patch release?) we could add more columns instead.
This cannot be "quickly enabled". The activity view has its own delegate that draws everything.
Column resizing, filtering etc moved in https://github.com/owncloud/client/issues/7619
2.6.1-daily20191127 (build 12791), macOS 10.15.1 shows cloud.domain.com (User Name)