diff --git a/resources/js/components/code-block.tsx b/resources/js/components/code-block.tsx
index cf04563d3..ddcb41c13 100644
--- a/resources/js/components/code-block.tsx
+++ b/resources/js/components/code-block.tsx
@@ -7,10 +7,12 @@ import { cn } from '@/lib/utils';
 
 export function CodeBlock({
     html,
+    wholeHtml,
     language,
     isCopyable = true,
 }: {
     html: string;
+    wholeHtml?: string;
     language: string | null;
     isCopyable?: boolean;
 }) {
@@ -34,7 +36,15 @@ export function CodeBlock({
             return;
         }
 
-        if (await copy(codeRef.current.textContent ?? '')) {
+        // A template's content is inert: nothing in it loads or runs.
+        const whole = document.createElement('template');
+        whole.innerHTML = wholeHtml ?? '';
+        const code =
+            wholeHtml === undefined
+                ? codeRef.current.textContent
+                : whole.content.textContent;
+
+        if (await copy(code ?? '')) {
             setIsCopied(true);
 
             return;
diff --git a/resources/js/components/commit-body.tsx b/resources/js/components/commit-body.tsx
index fac23d0a0..13745fe46 100644
--- a/resources/js/components/commit-body.tsx
+++ b/resources/js/components/commit-body.tsx
@@ -91,6 +91,7 @@ export function BodySegments({
                             <CodeBlock
                                 key={index}
                                 html={segment.html}
+                                wholeHtml={segment.wholeHtml}
                                 language={segment.language}
                                 isCopyable={!isStatic}
                             />
@@ -128,6 +129,20 @@ export function FoldedCommitBody({
         );
     }
 
+    // The preview only ever cuts a code block that starts the body, and what comes before it is the same in both, so
+    // its first block copies the whole block at the same place.
+    const firstBlock = previewSegments.findIndex(
+        (segment) => segment.type === 'block',
+    );
+    const whole = segments[firstBlock];
+    const preview = previewSegments.map((segment, index) =>
+        index === firstBlock &&
+        segment.type === 'block' &&
+        whole?.type === 'block'
+            ? { ...segment, wholeHtml: whole.html }
+            : segment,
+    );
+
     // The button goes away, so focus moves to what was unfolded: the commit card, which the keyboard shortcuts walk,
     // or the body itself inside a reply, which they don't.
     const unfold = (button: HTMLButtonElement) => {
@@ -147,7 +162,7 @@ export function FoldedCommitBody({
     return (
         <div ref={bodyRef} tabIndex={-1} className="outline-none">
             <CommitBody
-                segments={isUnfolded ? segments : previewSegments}
+                segments={isUnfolded ? segments : preview}
                 mentions={mentions}
                 className={className}
             />
diff --git a/resources/js/types/commit.ts b/resources/js/types/commit.ts
index 8af6a4e68..079052a93 100644
--- a/resources/js/types/commit.ts
+++ b/resources/js/types/commit.ts
@@ -50,7 +50,13 @@ export type CommitImage = {
 export type BodySegment =
     | { type: 'text'; text: string }
     | { type: 'code'; code: string }
-    | { type: 'block'; language: string | null; html: string };
+    | {
+          type: 'block';
+          language: string | null;
+          html: string;
+          // The whole block, when a folded body shows only its first lines.
+          wholeHtml?: string;
+      };
 
 export type CommitTranslation = {
     language: string;