fix ctrl-a for codeblocks (#1336)

packages/editor-ext/src/lib/custom-code-block.ts

@@ -35,6 +35,42 @@ export const CustomCodeBlock = CodeBlockLowlight.extend<CustomCodeBlockOptions>(
             return true;
           }
         },
+        "Mod-a": () => {
+          if (this.editor.isActive("codeBlock")) {
+            const { state } = this.editor;
+            const { $from } = state.selection;
+            
+            let codeBlockNode = null;
+            let codeBlockPos = null;
+            let depth = 0;
+            
+            for (depth = $from.depth; depth > 0; depth--) {
+              const node = $from.node(depth);
+              if (node.type.name === "codeBlock") {
+                codeBlockNode = node;
+                codeBlockPos = $from.start(depth) - 1;
+                break;
+              }
+            }
+            
+            if (codeBlockNode && codeBlockPos !== null) {
+              const codeBlockStart = codeBlockPos;
+              const codeBlockEnd = codeBlockPos + codeBlockNode.nodeSize;
+              
+              const contentStart = codeBlockStart + 1;
+              const contentEnd = codeBlockEnd - 1;
+              
+              this.editor.commands.setTextSelection({
+                from: contentStart,
+                to: contentEnd,
+              });
+              
+              return true;
+            }
+          }
+          
+          return false;
+        },
       };
     },