Prevent code blocks from flickering while streaming

modules/html_generator.py

@@ -71,10 +71,9 @@ def convert_to_markdown(string):
         else:
             result += '\n\n'
 
-    if is_code:
-        result = result + '```'  # Unfinished code block
-
     result = result.strip()
+    if is_code:
+        result += '\n```'  # Unfinished code block
 
     # Unfinished list, like "\n1.". A |delete| string is added and then
     # removed to force a <ol> or <ul> to be generated instead of a <p>.