Easyadminbundle: No confirmation alert on leaving edit page after changes with WYSIWYG editor

[bocharsky-bw]

Describe the bug
When I do some changes in WYSIWYG editor:

And reload the page forgetting saving the changes - no confirmation alert as for other fields. I expect this:

To Reproduce

1. Go to edit page
2. Edit content in the WYSIWYG editor
3. Reload the page

[javiereguiluz]

These fields are very special because they are created dynamically with JavaScript.

We add for example some JS code to add the validation error messages in them (because the client-side browser HTML5 validation doesn't work either).

So, we'd need o check if the jQuery plugin we use for this _"There are unsaved changes"_ feature support this ... otherwise, we'd need to add some custom code to take care of this.

I don't have time for this ... so I hope someone from the community gives a try. Thanks! _(we'll merge it unless the fix requires a ton of changes)_.

[rogamoore]

I did a quick test and with adding the following to assets/js/form-type-text-editor.js we could enable the warning for the TextEditorField:

document.addEventListener("trix-change", function (event) {
  $(event.target).parents("form").trigger("checkform.areYouSure");
});

The solution for the CodeEditorField would probably look similar.

I don't have time for a PR this week, but meanwhile an easy workaround would be:

• create a custom js file with above lines
• use configureAssets() in your DashboardController to load the custom js (see https://symfony.com/doc/master/bundles/EasyAdminBundle/design.html#adding-custom-web-assets for details)

[rogamoore]

I created a PR https://github.com/EasyCorp/EasyAdminBundle/pull/3860 for the TrixEditor case - please let me know if it works for you