fix: Backspace at the beginning of code block should convert to paragraph

shared/editor/nodes/CodeBlock.ts

@@ -1,4 +1,5 @@
 import { NodeType } from "prosemirror-model";
+import backspaceToParagraph from "../commands/backspaceToParagraph";
 import { selectAll } from "../commands/selectAll";
 import CodeFence from "./CodeFence";
 
@@ -13,6 +14,7 @@ export default class CodeBlock extends CodeFence {
 
   keys({ type }: { type: NodeType }) {
     return {
+      Backspace: backspaceToParagraph(type),
       "Mod-a": selectAll(type),
     };
   }

shared/editor/nodes/CodeFence.ts

@@ -62,6 +62,7 @@ import type { Dictionary } from "~/hooks/useDictionary";
 import { UserPreferences } from "../../types";
 import Storage from "../../utils/Storage";
 import { isMac } from "../../utils/browser";
+import backspaceToParagraph from "../commands/backspaceToParagraph";
 import {
   newlineInCode,
   insertSpaceTab,
@@ -255,6 +256,7 @@ export default class CodeFence extends Node {
 
         return newlineInCode(state, dispatch);
       },
+      Backspace: backspaceToParagraph(type),
       "Shift-Enter": newlineInCode,
       "Mod-a": selectAll(type),
     };