Cannot 'Join conversation' of a file inside a group folder I already had permissions, after it has been shared to me again.

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Bug description

I cannot 'join conversation' of a file in a group folder I already have access to, when it has been shared again with me through the 'search for share recipients' function.

Instead, I am invited to re-share the file.

Steps to reproduce

1. Alice creates a file in a group folder to which Bob has already access to

2. Alice shares the file with Bob through the 'search for share recipients' function by finding and clicking his name

3. When Bob finds the file in that group folder and enters the 'Chat' sub-menu of that file, he cannot find 'Join conversation'. Instead, he faces a 'Share this file' button.

4. If Bob clicks 'Share this file', as wrongly indicated (because it already is in a group folder), Bob is redirected to the 'Sharing' sub-menu of the same file.

5. Alternatively, if Bob enters his personal folder 'Shared' and finds the file, inside the 'Chat' sub-menu, the 'Join conversation' button is being shown. However, if he clicks on it, nothing happens.

See below for videos of the behavior. The console indicates an error each time I click the relevant button.

https://user-images.githubusercontent.com/36952462/235714948-a8631a8c-2404-438e-aa81-8d0a099e3fe4.mp4

https://user-images.githubusercontent.com/36952462/235714970-7abf83ba-df4c-4f0f-8346-917e5326ea01.mp4

Expected behaviour

Bob is able to press the 'Join conversation' button and join the conversation.

'Share this file' button not being shown at all.

Actual behaviour

If Bob clicks 'Share this file', as wrongly indicated (because it already is in a group folder), Bob is redirected to the 'Sharing' sub-menu of the same file.

Alternatively, if Bob enters his personal folder 'Shared' and finds the file, inside the 'Chat' sub-menu, the 'Join conversation' button is being shown. However, if he clicks on it, nothing happens.

Talk app

Talk app version: Talk 15.0.5

Custom Signaling server configured: yes. high-performance backend

Custom TURN server configured: yes

Custom STUN server configured: yes

Browser

Microphone available: yes

Camera available: yes

Operating system: Ubuntu/Windows

Browser name: Edge

Browser version: Version 110.0.1587.69

Browser log

Console output in attached videos

Server configuration

Operating system: Ubuntu

Web server: None

Database: MySQL

PHP version: 8.1

Nextcloud Version: 25

List of activated apps:

Available upon request

Nextcloud configuration:

Available upon request

Server log (data/nextcloud.log)

Available upon request

Start by reproducing the sharing flow in Nextcloud Talk 15.0.5: share a file from a group folder to a user who already has access, then compare the Chat submenu with the personal Shared folder and review the console errors. Done means the correct Join conversation action appears for the group-folder file, works when clicked, and Share this file is not shown incorrectly.