Dispatch ChangeSet instead of creating new EditorState on resetView in CodeBlock (#2243)

Author: laurakwhit

src/lib/holocene/code-block.svelte

@@ -159,8 +159,13 @@
 
   export const resetView = (value = '', format = true) => {
     const formattedValue = format ? formatValue({ value, language }) : value;
-    const newState = createEditorState(formattedValue);
-    view.setState(newState);
+    view.dispatch({
+      changes: {
+        from: 0,
+        to: view.state.doc.length,
+        insert: formattedValue,
+      },
+    });
   };
 
   const setView = () => {