convert "修复了大段用户输入时溢出的问题"

this partially convert ead342edcea32964bc51b80c6f9d0a93b5eee6f2

modules/utils.py

@@ -115,8 +115,7 @@ def convert_mdtext(md_text):
 
 
 def convert_asis(userinput):
-    escaped_html = html.escape(userinput).replace(" ", "&nbsp;").replace("\n", "<br>")
-    return f"{escaped_html}"+ALREADY_CONVERTED_MARK
+    return f"<pre>{html.escape(userinput)}</pre>"+ALREADY_CONVERTED_MARK
 
 def detect_converted_mark(userinput):
     if userinput.endswith(ALREADY_CONVERTED_MARK):