Feat: Fixed the issue where the prompt always displayed the initial value when switching between different generate operators #4764 (#4808)

### What problem does this PR solve?

Feat: Fixed the issue where the prompt always displayed the initial
value when switching between different generate operators #4764

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/components/prompt-editor/variable-on-change-plugin.tsx

@@ -0,0 +1,35 @@
+import { useLexicalComposerContext } from '@lexical/react/LexicalComposerContext';
+import { EditorState, LexicalEditor } from 'lexical';
+import { useEffect } from 'react';
+import { ProgrammaticTag } from './constant';
+
+interface IProps {
+  onChange: (
+    editorState: EditorState,
+    editor?: LexicalEditor,
+    tags?: Set<string>,
+  ) => void;
+}
+
+export function VariableOnChangePlugin({ onChange }: IProps) {
+  // Access the editor through the LexicalComposerContext
+  const [editor] = useLexicalComposerContext();
+  // Wrap our listener in useEffect to handle the teardown and avoid stale references.
+  useEffect(() => {
+    // most listeners return a teardown function that can be called to clean them up.
+    return editor.registerUpdateListener(
+      ({ editorState, tags, dirtyElements }) => {
+        // Check if there is a "programmatic" tag
+        const isProgrammaticUpdate = tags.has(ProgrammaticTag);
+
+        // The onchange event is only triggered when the data is manually updated
+        // Otherwise, the content will be displayed incorrectly.
+        if (dirtyElements.size > 0 && !isProgrammaticUpdate) {
+          onChange(editorState);
+        }
+      },
+    );
+  }, [editor, onChange]);
+
+  return null;
+}