[bug] When entering a large content into string input property, code editor does not register it correctly

1. Add File Storage with Write to File action
2. Inside "Content" tab paste content of the attached file
3. Enter Code Editor
4. Lines are not shown correctly

[LargeStringInput.json](https://github.com/user-attachments/files/26532548/LargeStringInput.json)

Reproduce the issue using the attached LargeStringInput.json: add File Storage with the Write to File action, paste the file into the Content tab, and open the Code Editor. Start by tracing the string-input and code-editor path involved in rendering the pasted content. Done means the large content displays with its lines correctly in the editor.

Written by the indexing model from the issue text.