thunderbird snap IMAP storage grows at an incredible rate

[Michael Neuffer]

I just had up grow the LV of my home directory by another 50GB.....

For the last 30 years I've collected roughly 9GB of old email.
Since the enforced migration from a properly working non-snap Thunderbird to a snap-infested Thunderbird
a few months ago its storage has grown from 9GB to now 90GB.

Every now and again it seems to re-download ALL messages from all IMAP accounts and grow by another 9GB

Right now the files have grwon to:

1021604 global-messages-db.sqlite
91956864 ImapMail

Within ImapMail there now seem to be <servername>-1.<topleveldomain>[.msf]
backupfiles.

Before the snapped version this behaviour did not exit.
Please fix.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
ProcVersionSignature: Ubuntu 6.8.0-35.35-generic 6.8.4
Uname: Linux 6.8.0-35-generic x86_64
ApportVersion: 2.28.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: XFCE
Date: Mon Jun 10 17:28:47 2024
InstallationDate: Installed on 2023-10-01 (253 days ago)
InstallationMedia: Xubuntu 23.10 "Mantic Minotaur" - Beta amd64 (20230919.1)
Snap: thunderbird 115.11.1-1 (latest/stable)
SnapChanges: no changes found
SnapSource: ubuntu/+source/thunderbird
UpgradeStatus: No upgrade log present (probably fresh install)