[Bug] Font size changes after I destroy and create editor instance

Reproducible in vscode.dev or in VS Code Desktop?

• Not reproducible in vscode.dev or VS Code Desktop

Reproducible in the monaco editor playground?

• Not reproducible in the monaco editor playground

Monaco Editor Playground Link

https://microsoft.github.io/monaco-editor/playground.html?source=v0.52.0#XQAAAAJqBAAAAAAAAABBqQkHQ5NjdVKIfkDi6SE6eJIbQyteFotciG7lKwh8wfIZ36OGD47nBRTK6zV7toIBs2O5GCJoRJ17GWu3dzLMrVeQg8lDNo5C5IsGbN5X3yVU_goa8kylb35AgX74t8fhMsaN38UxRlwliqsgRHk8DKKEdEFxy49_9oP8-yYptg-YyxPV3HkgXmYD4GCxG7xOT0Fl2GSHFKfVgCika6sWhJNLchhy2FKthrpxv8q-oGs9RoVe-fzST8bhsxCMZIaYN3sU_eOkQ0uVAM4K4K5JEZDqfe00scutsdHdg67Y8znXuXetLU7CoWmy10Gc-W5jv0UzVvrAjD_VY_0nBdRJRiL6l8AsBhBSg2OsPLgzgAxyYopcdu5GNtobz7hopLs2tCZL7IlxPujK_pv_NNrKE1KngzKT3FzpuHrf5zUkS5WlH9MoJ2l0bSMSBvN7GT_psjGJjO9p3kE3lkVsRMJyBRrB8mmEHsY_LKVTTOatXVoPokJI7y_qYaGRBQR7BHVfpcVkHF-lkomo0Ujz6O8ZLHQUl3sOMK4n09YJszoHq4lqLbftFmTrXdcN6M-NnSfjxfD5-dDIUS13e7FIIYnHidXqRcRwv1vVDjnviRFLn3F1beuOBhjHsxy5GOTGVNhoa7K99Zu6RRkbbFKFjffhz8DsNJsxqTg1PbbLe0P8DG6iVxTaVSf6pdqYWAHMhy_-_3T7wjg

Monaco Editor Playground Code

let localStorage_fontSize = '';

function createEditor() {
  const options = {
    value: '<div>Some text goes here</div>',
    language: "html",
    fontSize: 12,
  };

  const fontSize = localStorage_fontSize;
  if (fontSize && /\d+(\.\d+)?/.test(fontSize)) {
    options.fontSize = parseFloat(fontSize);
  }

  const editor = monaco.editor.create(document.getElementById("editor"), options);

  // listen font size change and save new value in local storage
  editor.onDidChangeConfiguration((e) => {
    if (!e.hasChanged(monaco.editor.EditorOption.fontSize)) {
      return;
    }

    localStorage_fontSize = editor.getOption(monaco.editor.EditorOption.fontSize).toString();
  });

  return editor;
}

let editor = createEditor();

document.getElementById('create').addEventListener('click', function () {
  editor = createEditor();
});

document.getElementById('destroy').addEventListener('click', function () {
  editor.dispose();
});

Reproduction Steps

1. Open playground
2. Increate/decrease font size once
   
3. Click destroy button
4. Click create button

Actual (Problematic) Behavior

Font size changes twice. Instead of 13.2px (lets assume we are increasing font size and default value was 12px) it becomes 14.52px.

Expected Behavior

The font size does not change after instance re-creation.

Additional Context

It's easy to reproduce when you use any client router and monaco editor at the same time. In my case it's react-router. When I change font size, navigate away from the page and come back - font size changes one more time.

Start with the linked Monaco Editor Playground reproduction and run the destroy/create sequence after changing the font size. Trace the editor lifecycle and configuration-change listener shown in the playground code, especially how the saved font size is read and updated. Done means recreating the editor preserves the selected font size without applying the change twice, including after navigation-like disposal and recreation.