Make render_emoji_as_string = "both" work with rich_text blocks (#902)

Commit 74da30342e8d328fc085d2158e37afda3b908f2c added support for using
rich_text blocks to format messages. With this change, the use of
replace_string_with_emoji() for text type "emoji" can result in running
the replacement twice as replace_string_with_emoji() is also called as
one of the last steps in SlackMessage.render().

This works fine in the default case when render_emoji_as_string = "",
however render_emoji_as_string = "both" results in output like:

  😄 (😄 (:smile:))

instead of the intended:

  😄 (:smile:)

This excludes blocks rendered earlier in the method from the second
call of replace_string_with_emoji().

1 files changed, 2 insertions, 0 deletions

diff --git a/_pytest/conftest.py b/_pytest/conftest.py
index 90e064e..5f1fde4 100644
--- a/_pytest/conftest.py
+++ b/_pytest/conftest.py
@@ -152,6 +152,8 @@ class FakeWeechat:
     def info_get(self, info_name, arguments):
         if info_name == "color_rgb2term":
             return arguments
+        elif info_name == "weechat_data_dir":
+            return "."
         else:
             return ""