fix: parsing RichText in some cases

https://t.me/kurigram_chat/5/294423

Author: KurimuzonAkuma

pyrogram/types/messages_and_media/rich_text.py

@@ -196,31 +196,31 @@ async def _parse(
 
             return RichTextMention(
                 text=content,
-                username=content.lstrip("@"),
+                username=RichText._to_plain_text(content).lstrip("@"),
             )
 
         if isinstance(rich_text, raw.types.TextHashtag):
             content = await RichText._parse(client, rich_text.text)
 
             return RichTextHashtag(
                 text=content,
-                hashtag=content.lstrip("#"),
+                hashtag=RichText._to_plain_text(content).lstrip("#"),
             )
 
         if isinstance(rich_text, raw.types.TextCashtag):
             content = await RichText._parse(client, rich_text.text)
 
             return RichTextCashtag(
                 text=content,
-                cashtag=content.lstrip("$"),
+                cashtag=RichText._to_plain_text(content).lstrip("$"),
             )
 
         if isinstance(rich_text, raw.types.TextBotCommand):
             content = await RichText._parse(client, rich_text.text)
 
             return RichTextBotCommand(
                 text=content,
-                bot_command=content.lstrip("/"),
+                bot_command=RichText._to_plain_text(content).lstrip("/"),
             )
 
         if isinstance(rich_text, raw.types.TextAnchor):
@@ -235,6 +235,27 @@ async def _parse(
 
         # TODO: if isinstance(rich_text, raw.types.TextImage):
 
+    @staticmethod
+    def _to_plain_text(text: "RichText") -> str:
+        if isinstance(text, str):
+            return text
+
+        if isinstance(text, (list, types.List)):
+            return "".join(RichText._to_plain_text(t) for t in text)
+
+        if hasattr(text, "text"):
+            return RichText._to_plain_text(text.text)
+
+        # Math expression
+        if hasattr(text, "expression"):
+            return RichText._to_plain_text(text.expression)
+
+        # Custom emoji
+        if hasattr(text, "alternative_text"):
+            return RichText._to_plain_text(text.alternative_text)
+
+        return ""
+
 
 class RichTextBold(RichText):
     """A bold text.