[CC Projects] Extra line added to the start of some code blocks (#1268)

Fixes the following extra line bug in projects-ui editor projects:
<img width="540" height="263" alt="image"
src="https://github.com/user-attachments/assets/0c56f8d2-ced4-43e8-9c4b-92cb3a812e65"
/>



closes #1267

---------

Co-authored-by: create-issue-branch[bot] <53036503+create-issue-branch[bot]@users.noreply.github.com>
Co-authored-by: Ram Modhvadia <ram.modhvadia@raspberrypi.org>
Co-authored-by: Patrick Cherry <patch0@users.noreply.github.com>

Author: 3 people

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-All notable changes to this project will be documented in this file. 
+All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
@@ -25,6 +25,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Sidebar panel overflow for plugins (#1266, #1269)
 - Extra border around code output in the instructions panel (#1253)
 - Line numbering alignment in code blocks in the instructions panel (#1259)
+- Extra lines added at the start of some code blocks (#1267)
 
 ## [0.33.0] - 2025-10-15
 

src/components/Menus/Sidebar/InstructionsPanel/InstructionsPanel.jsx

@@ -27,6 +27,12 @@ const InstructionsPanel = () => {
         "remove-initial-line-feed": true,
         "left-trim": false,
       });
+      Prism.hooks.add("before-sanity-check", function (env) {
+        if (!env.code) return;
+
+        // Remove multiple leading blank lines (empty or whitespace-only)
+        env.code = env.code.replace(/^(?:\s*\n)+/, "");
+      });
     }
   }, []);
   const [showModal, setShowModal] = useState(false);