Rich text editor: setting delta value breaking on some value change modes

[stefanuebe]

Description

When using the value change modes lazy or timeout, it is not possible to set an initial delta value via asDelta().setValue(myDelta) . The RTE stays empty.

A workaround is to delegate the setting:

editor.getElement()
    .executeJs("")
    .then(_unused -> editor.asDelta().setValue(initialValue));

Expected outcome

All value change modes should work.

Minimal reproducible example

@Route("")
public class RteView extends VerticalLayout {

    public RteView() {
        var editor = new RichTextEditor();
        editor.setValueChangeMode(ValueChangeMode.LAZY);
        editor.asDelta().setValue("[" +
                "{\"insert\":\"Stock \"}," +
                "{\"insert\":\"RTE\",\"attributes\":{\"bold\":true}}," +
                "{\"insert\":\" from Vaadin 25\\n" +
                "This is the unmodified Vaadin Rich Text Editor for comparison.\\n\"}" +
                "]");
    }
}

Steps to reproduce

Download a starter, add the view and load the app. The RTE stays empty.

Remove the value change mode and it works.

Environment

Vaadin version(s): 25.0.6
OS: Kubuntu 25

Browsers

No response

[stefanuebe]

(The upcoming ERTE has this issue already fixed or at least it works with LAZY and TIMEOUT)

[yuriy-fix]

This requires further investigation on what is the actual cause of the issue with different value change modes.