WTextFields don't have the full functionality of a vanilla text field

[Baphomet42]

Unlike the vanilla anvil or command block text fields, WTextFields don't scroll horizontally when it is full of characters. It still allows characters to be typed, but they cannot be seen. Also the delete key has the same functionality as the backspace when used in a WTextField.

Unless there is an option I am unaware of, there is no way to make WTextFields scroll horizontally. It should be noted that the WTextFields I've tested on are inside of a WScrollPanel, so maybe that has something to do with it? The delete key works as normal when used inside a vanilla anvil or command block, it only has the backspace functionality in a WTextField, instead of deleting the character after the cursor.

[Juuxel]

All of this is known. That particular widget is a bunch of horror code that I don't have time to unravel (and not written by me in the first place).

If you want full functionality, you can try wrapping vanilla's text field widget in a LibGui WWidget. It's a bit tedious, but should work afaik.