• Prepared CardDav infra for extensibility
• Added Extension infrastructure
• ALPHA: Added Contacts extension - shipped disabled
• ALPHA: Added Calendar extension - shipped disabled - #28
• Updated extension translations:
  • Czech
  • French
  • German
  • Italian
  • Vietnamese
  • Chinese - CN, HK, TW
• Added shortcuts: V for View Message and D for Delete Message
• Added runtime config of client id/secret - #138
• Added force re-sync of contacts
• Added Vietnamese translation - PR #232
• Added separate smtp credentials option - #264
• Added no outgoing server option - #132 (#134)
• Added fallback for Mailfence and other non-quote-compliant providers - #209
• Added smtp auto-pre-fill of smtp from imap input - #179
• Added delete account button in settings accounts tab
• Fixed CardDav remove provider code path to not leave orphaned contacts in db
• Fixed Sent/Draft folder message listing - #227
• Fixed unified inbox actions - #234
• Fixed Microsoft admin pre-approved oauth - #29
• Fixed read/star polluting undo - #243
• Fixed duplicate unified inbox freeze - #241
• Fixed unparsible body fetch handling - #240
• Added incremental flag sync - #240
• Fixed drag-n-drop inline image - #224
• Fixed duplicate inline image rendering
• Fixed post action blank conversation pane - #271
• Fixed separate smtp creds persistence - #270
• Fixed plaintext reply/fwd - #285
• Fixed print feature - #280
• Fixed Windows links - #261
• Hardened Windows URL/attachment opening - Reported by @freemans32
• Fixed mail with no body + attachment - #293
• Bumped flatpak build to Gnome 50 runtime