Fix: "Code formatting button does not escape backticks" (#8181)

Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

src/editor/deserialize.ts

@@ -32,7 +32,7 @@ function escape(text: string): string {
 
 // Finds the length of the longest backtick sequence in the given text, used for
 // escaping backticks in code blocks
-function longestBacktickSequence(text: string): number {
+export function longestBacktickSequence(text: string): number {
     let length = 0;
     let currentLength = 0;