diff --git a/web/src/compose_ui.ts b/web/src/compose_ui.ts
index ed8488c59a..2ee49ee644 100644
--- a/web/src/compose_ui.ts
+++ b/web/src/compose_ui.ts
@@ -433,15 +433,17 @@ export function cursor_inside_code_block($textarea: JQuery<HTMLTextAreaElement>)
     const cursor_position = $textarea.caret();
     const current_content = $textarea.val()!;
 
+    return position_inside_code_block(current_content, cursor_position);
+}
+
+export function position_inside_code_block(content: string, position: number): boolean {
     let unique_insert = "UNIQUEINSERT:" + Math.random();
-    while (current_content.includes(unique_insert)) {
+    while (content.includes(unique_insert)) {
         unique_insert = "UNIQUEINSERT:" + Math.random();
     }
-    const content =
-        current_content.slice(0, cursor_position) +
-        unique_insert +
-        current_content.slice(cursor_position);
-    const rendered_content = markdown.parse_non_message(content);
+    const unique_insert_content =
+        content.slice(0, position) + unique_insert + content.slice(position);
+    const rendered_content = markdown.parse_non_message(unique_insert_content);
     const rendered_html = new DOMParser().parseFromString(rendered_content, "text/html");
     const code_blocks = rendered_html.querySelectorAll("pre > code");
     return [...code_blocks].some((code_block) => code_block?.textContent?.includes(unique_insert));