[Bug] Editing original model in inline diff viewer not possible even if it should be based on configuration options

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=v0.55.1#XQAAAAJjAgAAAAAAAABBqQkHQ5NjdMjwa-jY7SIQ9S7DNlzs5W-mwj0fe1ZCDRFc9ws9XQE0SJE1jc2VKxhaLFIw9vEWSxW3yscw1ywOc3g3TZokiQe3t547J-9ebB9cYURQV2C_HyzmFKq-zHr7CL5opGlpi_AOvKvzZ3i3ITvDrqy_CgWLe8nzPfRcjGsigwE9_J2qOtPn88pmhu9_yKIbFcbbOldJxbsZ9LkVEh_hzRCzlJWgqN9MOF72YHODV1uZEj0HtZq3JRXxYNUUXVYqGIDguR07WhPWmy4POSvcvO4BR2YcCzfmfK5ZDnxw2Fbf91l4zAyMZHYEiY5QdFX4EoNu8IIpxG26RVpzI0DTeg-y9ZJdmFRQ2WtKP9Z-dTEyLOkyISB0vZeBBTroraw10xURz68D9vhkg3m0pjN7m8l0LPLIm1ulGWNVRVw2of6eexD9nI1XRacX_3t1zgA

Monaco Editor Playground Code

var originalModel = monaco.editor.createModel(
	"This line is removed on the right.\njust some text\nabcd\nefgh\nSome more text",
	"text/plain"
);

var modifiedModel = monaco.editor.createModel(
	"just some text\nabcz\nzzzzefgh\nSome more text\nThis line is removed on the left.",
	"text/plain"
);

var diffEditor = monaco.editor.createDiffEditor(
	document.getElementById("container"),
	{
		renderSideBySide: false,
		originalEditable: true,
		readOnly: true, // Can be either true or false
	}
);

diffEditor.setModel({
	original: originalModel,
	modified: modifiedModel,
});

Reproduction Steps

With the code above, attempt to edit the original model in the diff editor.

Actual (Problematic) Behavior

The original model is not editable in an inline diff editor even though originalEditable is true. If the diff editor wasn't inline, the original model would be editable.

Expected Behavior

The original model should be editable.

Additional Context

No response

Start with the Monaco Editor Playground link and the provided TypeScript reproduction, focusing on createDiffEditor options for inline mode, originalEditable, and readOnly. Confirm the behavior with the supplied models, then make the original model editable in inline diff mode when originalEditable is true and verify that readOnly still controls the expected editing behavior.