Ok I found the bug with the font-size. If you use "On start of layout" or "On TextBox created" to set the font-size, the behavior resets this setting, so with "Every tick" it is working but wasting resources. But since your last update it's even works with this two too. So it is fixed
But i don't really get the AutoFontSize option, what exactly is it doing? And a font-size property would be awesome too, so i dont have to use the css action.
The "Selectable" option was not working before the update, I tested this with every combination i could, but since the update it has the same function as the native "Enabled" property ... so i can not select the text but also can not typing
The both new properties are working awesome
Some optional cosmetic request:
Marge the two border properties, like the outline one to safe some space and replace the description from "0 to disable" to "none to disable" for both. But this is purely cosmetic, the behavior is awesome even without
The next step would be to add some expressions like "pointer position" and "selected text"
Keep up the good work, this is one of the best additions for the textbox plugin ever made. Good job bro