Geary loops forever with "Claiming folder session"
I'm trying Geary built from git mainline on Ubuntu 20.04.
If I delete my Geary folders and then run Geary to start with a fresh database, I see email messages in my inboxes, but the progress spinner in the lower left spins forever. The log shows a steady stream of "Claiming folder session" messages that seem to go on forever:
[deb] 18:59:26.0980 Geary: [goa_account_1591587948_1] [>Archive, open_count=1, remote_opened=true] GearyImapEngineOtherFolder: Claiming folder session
[deb] 18:59:26.0994 Geary: [goa_account_1591587948_1] [>Archive, open_count=1, remote_opened=true] GearyImapEngineOtherFolder: Claiming folder session
[deb] 18:59:27.0006 Geary: [goa_account_1591587948_1] [>Archive, open_count=1, remote_opened=true] GearyImapEngineOtherFolder: Claiming folder session
[deb] 18:59:27.0018 Geary: [goa_account_1592905834_0] [>Follow up, open_count=1, remote_opened=true] GearyImapEngineGmailFolder: Claiming folder session
[deb] 18:59:27.0019 Geary: [goa_account_1591587948_1] [>Archive, open_count=1, remote_opened=true] GearyImapEngineOtherFolder: Claiming folder session
[deb] 18:59:27.0034 Geary: [goa_account_1591587948_1] [>Archive, open_count=1, remote_opened=true] GearyImapEngineOtherFolder: Claiming folder session
[deb] 18:59:27.0046 Geary: [goa_account_1591587948_1] [>Archive, open_count=1, remote_opened=true] GearyImapEngineOtherFolder: Claiming folder session
[deb] 18:59:27.0060 Geary: [goa_account_1591587948_1] [>Archive, open_count=1, remote_opened=true] GearyImapEngineOtherFolder: Claiming folder session
Here's a log of about 20 seconds of this activity, starting with launching Geary with a fresh database: