* Implement mail tracking
Signed-off-by: Victor "multun" Collod <victor.collod@prologin.org>
* Implement task merging
* Add a mail tracker title format pattern
* Autocomplete task names
* Fix comment display
* Track notification answers
* Add a socket timeout for the mail worker
A mail worker is a long running application. And sometimes, the IMAP server
just hangs for hours for no apparent reason. imaplib doesn't enable setting
a timeout, and setting it globally seems fine.
* Only validate the merge form when submitted
* Redirect to the new form when merging
* Prettier task edit UI
* Make task merging optional
* Test mail tracking
* Update documentation for mail tracking
* Update dependencies
* Add the TODO_COMMENT_CLASSES setting
* Fix dependencies install order
* Remove debug leftovers, improve documentation
* Fail on missing from_address
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