@Gary: “Right-click on the Gmail account’s All Mail folder and choose Properties > Repair > Repair.”
Does not work. The favorite still exists, still pointing to a label that no longer exists. moving a message to this favorite event error, although clicking on the favorite as if to display just provides an empty message list.
@Gary: “remove the Gmail account, then add it back again”
I knew you were going to say this. It is one of the standard retorts of tech-support.
I have not done so yet because as far as I can tell removing an account and then adding it back again will result in a loss of the considerable work that I have spent in creating favorites and search folders.
Unless you can tell me that there is some way that I can save such work, the configuration of favorites and search folders, and then restore it later when the account is restored.
Now, I half suspect that somebody will tell me to use eMclient backup/restore,
e.g. Menu > Backup … Menu > File > Restore or create your accounts anew and import your local data back in (Menu > Tools > Accounts, Menu > File > Import)
but since it is one of the favorites that is broken, I cannot help but wonder if that will not cause further problems. as far as I know there is no way that I can tell it to be selective about what gets restored. Looking at the XML that is produced by Export, I see no mention of favorites or search folders. As far as I can tell the backup format is opaque.
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moreover, I do not need to get it automatically updated, since I can manually delete the broken favorite and then re-create it. which is less work than re-creating all of my non-broken favorites and search folders.
I am just reporting a bug. a place where a fairly common operation results in eMclient producing slightly broken data structures.