[Alias] Aliased commands retain newlines (#4656)

Co-authored-by: Michael Oliveira <34169552+Flame442@users.noreply.github.com>

redbot/cogs/alias/alias.py

@@ -150,6 +150,15 @@ class Alias(commands.Cog):
         raise ValueError("No prefix found.")
 
     async def call_alias(self, message: discord.Message, prefix: str, alias: AliasEntry):
+        new_message = self.translate_alias_message(message, prefix, alias)
+        await self.bot.process_commands(new_message)
+
+    def translate_alias_message(self, message: discord.Message, prefix: str, alias: AliasEntry):
+        """
+        Translates a discord message using an alias
+        for a command to a discord message using the
+        alias' base command.
+        """
         new_message = copy(message)
         try:
             args = alias.get_extra_args_from_alias(message, prefix)
@@ -163,7 +172,8 @@ class Alias(commands.Cog):
         new_message.content = "{}{} {}".format(
             prefix, command, " ".join(args[trackform.max + 1 :])
         ).strip()
-        await self.bot.process_commands(new_message)
+
+        return new_message
 
     async def paginate_alias_list(
         self, ctx: commands.Context, alias_list: List[AliasEntry]

redbot/cogs/alias/alias_entry.py

@@ -62,8 +62,7 @@ class AliasEntry:
             word = view.get_quoted_word()
             if len(word) < view.index - prev:
                 word = "".join((view.buffer[prev], word, view.buffer[view.index - 1]))
-            extra.append(word)
-            view.skip_ws()
+            extra.append(word.strip(" "))
         return extra
 
     def to_json(self) -> dict:

redbot/pytest/core.py

@@ -23,7 +23,9 @@ __all__ = [
     "empty_role",
     "empty_user",
     "member_factory",
+    "newline_message",
     "user_factory",
+    "prefix",
     "ctx",
 ]
 
@@ -142,6 +144,18 @@ def empty_message():
     return mock_msg("No content.")
 
 
+@pytest.fixture(scope="module")
+def newline_message():
+    mock_msg = type("", (), {})()
+    mock_msg.content = "!test a\nb\nc"
+    return mock_msg
+
+
+@pytest.fixture(scope="module")
+def prefix():
+    return "!"
+
+
 @pytest.fixture()
 def ctx(empty_member, empty_channel, red):
     mock_ctx = namedtuple("Context", "author guild channel message bot")