This adds a menu item to edit a self-sent text event. It also enables one to send an event with rel-type m.replace.

Type: add

• Verify unit tests pass.

Basic editing functionality:

• Open the menu for a self-sent text event.
• Verify that the Edit button is enabled.
• Click the Edit button.
• Verify that the send message box is filled with the body of that event.
• Input something in the send message box.
• Send the message.
• Verify that a local echo is displayed briefly and then the edited version is shown.

Get the correct body for a reply event:

• Send a message replying to some other text event from Element Web.
• Edit that message from kazv.
• Verify that the send message box is only filled with the actual content, not the quotation.

Edit an edited event:

• Edit an edited event.
• Verify that the body of the newest is in the send message box.

Reply functionality:

• Reply to an event in kazv.
• Verify that the reply can be successfully sent.

Cancelling relationships:

• In the event menu click on Reply.
• Click the (x) button on the top-right of the send message box.
• Verify that the replied-to event is no longer displayed on the top.
• In the event menu click on Edit.
• Click the (x) button on the top-right of the send message box.
• Verify that the event being edited is no longer displayed on the top.
• Verify that the send message box still contains whatever it contained before clicking (x).