Ensure warning is sent when DM'ing a deleted Gitter user
As brought up by @piegames:matrix.org
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Ensure warning is sent when DM'ing a deleted Gitter user, "Unable to invite Gitter user back to DM room because they deleted their account."
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Relevant code
Alternatives
- Deactivate Matrix user when Gitter user is deleted, https://matrix.org/docs/spec/client_server/latest#post-matrix-client-r0-account-deactivate
- If someone signs into Gitter again, can we re-use that same MXID?
- "deactivation only makes the user leave all rooms and removes login info", "the erase stuff is non-federated and synapse-specific", -- @tulir
Edited by Eric Eastwood