UnityEditor.PackageManager.Client.SearchAll(offlineMode: true) returns an error saying Cannot connect to 'api.unity.com' (error code: ENOTFOUND) when the user is offline (no network). When offlineMode is true, this method is not supposed to reach out to the network so it should not fail when the user is offline.

Steps to reproduce

Disconnect from WiFi
Launch the Unity editor

Expected behaviour

The Package Manager Window, which calls Client.SearchAll, should report an error in the console saying Error searching for packages as well as the relevant Cannot perform upm operation log message which includes the reason why (2 messages total).

Actual behaviour

The Package Manager Window reports 2 errors in the console (4 messages total) for both Error searching for packages and Error searching for packages offline each with corresponding Cannot perform upm operation messages. This is because the Package Manager Window performs both an online search and an offline search on startup. When the user is offline, only the online search should fail.