Markdown code editing

Description:

When we use backticks [`] three times for a code block and start writing code immediately, it doesn't show code in a formatted way. It just shows a simple text. I am a heavy discord user and generally habituated of writing codes in that way by copy-pasting code directly from editor to text field without giving any newline.

Steps to reproduce:

1. Just type:

   ```for(;;)
   {
   printf("Hello!!");
   }```
   

Expected behaviour:

Actual behaviour:

Start by reproducing the exact triple-backtick input in the message composer and trace the Markdown editing or rendering path used by the text field. Done means code pasted immediately after the opening backticks is displayed as a formatted code block, matching the expected behavior shown in the issue.