Resolve the matter of UI resizing for BoxedEditorUIView

[oleq]

BoxedEditorUI defines observable width and height attributes. They should be bound with the logic of the View to resize editor via editor.ui.[width | height]. It

A followup of https://github.com/ckeditor/ckeditor5-ui/issues/22.

[Reinmar]

I'm not entirely sure we need this. So far you can easily resize editor using CSS. I implemented editorUI#width|height as a part of the prototype that we have in manual tests. It doesn't make that much sense though.

[oleq]

Alright, let's get rid of those orphans then because they suggest developers this is actually something that works and we know this is not true. A misleading piece of code, that's all.

[Reinmar]

PS. If you're looking for how to set CKEditor 5's height and width, then the news is that:

• There's no config.height and config.width like in CKEditor 4.
• You can just use CSS.

To set the height:

.ck-editor__editable {
    min-height: 400px;

    /* or: */
    height: 400px;
}

To set the width:

.ck-editor {
    width: 400px;
}