use draft/delete tags to mark BufferLines as deleted

modules/ircv3_editmsg.py

@@ -0,0 +1,13 @@
+from src import ModuleManager, utils
+
+DELETE_TAG = utils.irc.MessageTag(None, "draft/delete")
+
+class Module(ModuleManager.BaseModule):
+    @utils.hook("received.tagmsg.private")
+    @utils.hook("received.tagmsg.channel")
+    def tagmsg(self, event):
+        msgid = DELETE_TAG.get_value(event["line"].tags)
+        if msgid:
+            line = event["target"].buffer.find_id(msgid)
+            if line:
+                line.deleted = True