Note: that this release requires at least Java 11 or higher.
An Automatic-Module-Name entry of "org.fxmisc.richtext" has been added to the richtextfx-0.11.4.jar manifest.
While the fat Jar richtextfx-fat-0.11.4 has a module-info class.
Added double underlining by specifying the gap size. Works for both straight and wavy lines.
Use "-rtfx-underline-double-gap" in CSS.
See the Changelog for bug fixes and further details.