MSC4197: Copy Paste Hints!!!

proposals/4197-copy-hints.md

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+# MSC4197: Copy-Paste Hints
+
+In Matrix today, it can be used for communication. One thing that is communicated is two-factor auth codes. In other platforms, one convenience is being able to quickly copy-paste two factor auth codes. This is not possible in Matrix today.
+
+When sending a message, my message could contain a hint to the user's client that they should copy some particular part of the message. I propose to add a new field to `m.room.message` events that will hint to clients what text they could facilitating the user to copy.
+
+### Proposal
+
+* technical details
+* describe the solution (This is the solution. Be assertive.)
+
+`m.room.message` contains a new field, `copy_hint`, under the existing `content` dictionary. This new field will contain a string representing text that the client could present to the user to copy.
+
+An example is below:
+
+
+```json5
+{
+  "content": {
+    "body": "DO NOT SHARE THIS WITH ANYONE!!! Your 2FA code is: 100000",
+    "m.mentions": {},
+    "msgtype": "m.text",
+    "copy_hint": [23, 29]
+  },
+  "origin_server_ts": 1726936182830,
+  "sender": "@andrewm:element.io",
+  "type": "m.room.message",
+  "unsigned": {
+    "membership": "join",
+    "age": 54359693,
+    "transaction_id": "m1726936182657.27"
+  },
+  "event_id": "$4WvO6_skvEIibdffnDKdTkFHtOKUZaPFLm8HJuXcz7E",
+  "room_id": "!jWkHTegEyVsdPJkjHA:element.io"
+}
+```
+
+### Potential Issues
+
+None considered!
+
+### Alternatives
+
+1. `hints` dictionary.
+2. Leave things as is (please don't!)
+3. boolean `copy_hint` field (hint to client to copy the whole message)
+4. give up (similar to 2.)
+5. Use indexes in the message
+    * Harder to implement
+    * Use bandwidth
+6. If the event is encrypted, leave the 2FA code out of the encryption
+
+### Security Considerations
+
+TODO.
+
+### Unstable prefix
+
+What is this.
+
+### Dependencies
+
+I do not build on any giant's shoulders.