[QA] active sync folder can be re-used with a different sync connection

[jnweiger]

Seen with client 2.7.7-rc2 on Linux Mint

• connect ownCloud client to demo.owncloud.com
• note the sync folder
• connect testpilotcloud client to demo.owncloud.org, but specfy the sync folder of the other client.

• Click "Connect". Two servers are now connected to the same folder.

Expected behaviour: The folder should be exclusive to the first client that connects. The connecting a second client should fail.

Multiple connections to the same folder is untested. Especially scary with VFS options.

[jnweiger]

Same client can also connect the same user on the same server to the same folder a second time 🙈

[github-actions]

This issue was marked stale because it has been open for 30 days with no activity. Remove the stale label or comment or this will be closed in 7 days.

[github-actions]

The issue was marked as stale for 7 days and closed automatically.

[TheOneRing]

We don't handle branding names in the current code

client/src/gui/folderman.cpp

Line 1431 in c0a3ef9

QString FolderMan::checkPathValidityForNewFolder(const QString &path, const QUrl &serverUrl) const

I guess we need to come up with a different detection mechanism.