[invisible crypto] re-try decrypting messages after we've verified a user (or withdraw verification)

[uhoreg]

element-hq/matrix-react-sdk#50 enables decrypting in "invisible crypto" mode, and displays an error if you receive an event from a user who was verified, but changed their identity. However, if we re-verify the user (or withdraw verification, when that gets implemented), we don't re-try decrypting, so the error is still shown.

[andybalaam]

Duplicate of matrix-org/matrix-rust-sdk#3890 (please correct me if I'm wrong)

[uhoreg]

It's related, but I don't think it's exactly the same. This depends on the Rust work, but I think it will still need some work on the JS side to update the display.

[BillCarsonFr]

The most important is that new messages are shown correctly.
For previous messages for now the work-around is to close and re-enter the room.