fix(journal): ignore message edits so they stop recording duplicates

An edited `!journal ...` message was recorded as a brand-new entry, so
one message edited five times produced five near-identical rows.

Matrix delivers an edit as a fresh m.room.message, and mautrix swaps its
content for `m.new_content` during deserialization
(mautrix/types/event/message.py:393-396), stripping the "* " fallback
prefix. The handler therefore saw something byte-identical to a new
command. Neither @command.passive nor @command.new filters edits, so
guard on evt.content.get_edit() in the plugin.

Also corrects the README quirk that claimed edits could never reach the
bot — it asserted the opposite of the actual behavior.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019wNB1sgkcBGijWjKTjtwG8

journal/README.md

@@ -58,11 +58,26 @@ rather keep IDs monotonic across resets.)
 
 ## Known quirks
 
-- **Edited messages don't re-trigger the bot.** Matrix sends edits as
-  a separate `m.replace` event that bots don't react to. If you typed
-  `!journal` then edited the message to add content, the bot saw only
-  the empty `!journal` and won't record. Send a fresh message instead
-  of editing.
+- **Editing a recorded entry does nothing.** Edits are deliberately
+  ignored (since v0.2.1), so fixing a typo in a `!journal` message
+  leaves the stored entry unchanged. Send a fresh `!journal` message
+  instead of editing.
+
+  This bullet previously claimed the opposite — that edits can't reach
+  the bot at all. That was wrong, and the bug it hid was noisy: mautrix
+  swaps an edit's content for `m.new_content` before the plugin sees it
+  (`mautrix/types/event/message.py:393-396`), stripping the `* `
+  fallback prefix. The handler therefore received something identical
+  to a brand-new command and recorded a **duplicate entry on every
+  edit** — one journal message edited five times produced five rows.
+  Neither `@command.passive` nor `@command.new` filters edits, so any
+  maubot plugin matching on message bodies needs its own
+  `if evt.content.get_edit(): return` guard.
+
+- **Reactions are harmless.** They arrive as `m.reaction`, and
+  `@command.passive` only registers on `EventType.ROOM_MESSAGE` with
+  `msgtype` in `(m.text,)`, so a 👍 on a `!journal` message can never
+  trigger a recording.
 - **`!journal show <random text>` runs the show query with that text
   as the user filter.** If it doesn't match any MXID, you get
   "No entries." Use a fully-qualified MXID like `@pat:ariege.io`.

journal/journal.py

@@ -58,6 +58,17 @@ class JournalBot(Plugin):
 
     @command.passive(regex=_JOURNAL_RE)
     async def journal(self, evt: MessageEvent, match) -> None:
+        # Ignore edits. An edit arrives as a *fresh* m.room.message whose
+        # content mautrix transparently replaces with `m.new_content`
+        # (mautrix/types/event/message.py:393-396), stripping the "* "
+        # fallback prefix. The result is byte-identical to a new command,
+        # so every edit of a `!journal ...` message would record another
+        # duplicate entry. The relation survives that swap, which is what
+        # get_edit() reads. Neither @command.passive nor @command.new
+        # filters edits, so plugins must do it themselves.
+        if evt.content.get_edit():
+            return
+
         rest = (match[1] or "").strip()
 
         if not rest:

journal/maubot.yaml

@@ -1,6 +1,6 @@
 maubot: 0.1.0
 id: dev.aiolabs.journal
-version: 0.2.0
+version: 0.2.1
 license: AGPL-3.0-or-later
 modules:
   - journal