subtracting a hardcoded barHeight does not work when TinyMCE menubar is hidden

The height of tinyMCE depends on wether the tinyMCE menubar is shown. This has to be taken into account, when setting the inner size of the editor in _set_inner_size() method.

components/tinymce/tinymce.js

Line 64 in 1b1cedf

    
           this._3rd_editor.theme.resizeTo(this.$width, this.$height - this.config.barHeight);

barHeight can be configured in the widget's settings

webix.ui({ view:"tinymce-editor", barHeight: 55 })

This value can be adjusted according to your needs.
Unfortunately, the editor doesn't provide any API to set the full height.