I think the new look-and-feel class has a few very poor default choices for colours. (it has a ‘color theme’, the default one is called ‘Dark’. ‘Midnight’ shows the same issue) These can be observed in the demo on the widgets page.
TextEditors have by default a black background, but also a black background for selected text. And OK, it’s slightly grey, but the contrast is extremely low. Can you quickly tell which part of the 16.8 gallons text is selected?
CodeEditorComponent has a similar very low contrast for selected text.
Maybe we can set the background for selected text to a similar blue colour as the slider knobs?