monaco-editor/website/playground/new-samples/creating-the-diffeditor/navigating-a-diff/sample.js

// The diff editor offers a navigator to jump between changes. Once the diff is computed the <em>next()</em> and <em>previous()</em> method allow navigation. By default setting the selection in the editor manually resets the navigation state.
var originalModel = monaco.editor.createModel("just some text\n\nHello World\n\nSome more text", "text/plain");
var modifiedModel = monaco.editor.createModel("just some Text\n\nHello World\n\nSome more changes", "text/plain");


var diffEditor = monaco.editor.createDiffEditor(document.getElementById("container"));
diffEditor.setModel({
	original: originalModel,
	modified: modifiedModel
});

var navi = monaco.editor.createDiffNavigator(diffEditor, {
	followsCaret: true, // resets the navigator state when the user selects something in the editor
	ignoreCharChanges: true // jump from line to line
});

window.setInterval(function() {
	navi.next();
}, 2000);