When auto-format on file save is enabled for QML/JS editing, saving a .js file after making changes may distort or break the code formatting.

To reproduce the issue:

• Enable "auto format on file save" from Preferences->Qt Quick->QML/JS Editing.
• Open the attached file with Qt Creator.
• Edit the file and then save.

The original code.

class Foo {
    constructor(window) {
        
     }
    
} 

The saved file output:

constructorfunction (window) {}