Follow up for "scheduled sending" and "undo sending" features

[JuliaKirschenheuter]

Is your feature request related to a problem? Please describe.

Related to: #5884

Todo (ordered by importance)

• Automatically update the outbox envelopes list #6246
• Move modal when discarding a message into a toast #6268
• Rename "Outbox draft" into "Edit message" for composer modal title #6266
• Set default date and time for "custom send time" to one hour into the future #6269

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• Use Undo Sending for "Send now" button in the outbox #6248
• Fix custom date and time breaking when editing a message #6292
• Unify Icon usage for sending #6247
• Outbox envelopes on hover jump around because of missing subject line #6267
• Scheduled sending dialogue: Dialogue is very hidden. #6243
• Scheduled sending dialogue: offer more default options #6244
• Show delete outbox feedback #6288

Critical bugs and other follow-ups

• Saving a draft reports success even if it fails #6157
• PageController uses LocalMessageMapper, should use OutboxService #6161
• Outbox doesn't set \\answered to cross-account replies #6189
• Avoid double sending of an outbox message #6194
• Disallow scheduled sending for instances using AjaxCron #6195
• Outbox message is sent while it's edited #6156

[ChristophWurst]

@miaulalala @JuliaKirschenheuter could you please convert the tasks of this ticket into standalone tickets? Think: could someone else understand the problem of the description without following all linked parent tickets? Cases like #6273 will be hard to follow in a few weeks time when we don't have our minds occupied with the outbox feature anymore. Try to make this a decent bug report or feature request ticket, whatever is more appropriate. The four important bits of this tickets are done and therefore I would close this one.

Cheers

[ChristophWurst]

@miaulalala @JuliaKirschenheuter could one of you please take care?

[miaulalala]

@ChristophWurst closing this now as all tickets are able to be understood on their own.