TextField/TextArea without fixed width cause native crash in JBR 21

[rock3r]

After #521, when TextField and TextArea don't have a fixed width, they cause a native crash in the JBR (at least when running in an IJ plugin)

[rock3r]

Will be solved in #554 — can't know for sure what the issue was, but it seemed to stem from a very poor implementation of BTF2 in #521, and possibly something random-looking like, dunno, the lunar phase.

[rock3r]

(I would push the fix buuuut they've temporarily removed my permissions from this repo, so I can't push)

[rock3r]

Fixed in a601251

After the last rebase, it's e66de7b