v1.18.4-rc.2

Bugfixes:

- #7991: Encryption trailer not updated on shortcut
- #7994: Index "out of sync with reality" on receive-encrypted folder
- #8000: stdiscosrv + strelaysrv systemd services not restarting on upgrade
- #8012: Not retrying to sync when a new connection is established

Enhancements:

- #4293: make "Reduced by ignore patterns" label act like "editIgnoresButton"
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