CSS warning from default code block styling unless `-mdfx-code-block-*` properties are set explicitly

[Dansoftowner]

When using jpro-mdfx's MarkdownView, JavaFX prints CSS conversion warnings for code block styling.

Environment

• jpro-mdfx: 0.6.2
• JavaFX: 26
• OpenJDK 25
• OS: Windows

Warning

javafx.scene.CssStyleHelper calculateValue
WARNING: Caught 'java.lang.ClassCastException: class java.lang.String cannot be cast to class javafx.scene.paint.Paint
(java.lang.String is in module java.base of loader 'bootstrap'; javafx.scene.paint.Paint is in module javafx.graphics@26 of loader 'app')'
while converting value for '-fx-border-color' from rule '*.markdown-code-background' in stylesheet jar:file:///.../mdfx/mdfx.css

WARNING: Caught 'java.lang.ClassCastException: class java.lang.String cannot be cast to class javafx.scene.paint.Paint 
(java.lang.String is in module java.base of loader 'bootstrap'; javafx.scene.paint.Paint is in module javafx.graphics@26 of loader 'app')' 
while converting value for '-fx-background-color' from rule '*.markdown-code-block *.code-text-flow' in stylesheet jar:file:///.../mdfx/mdfx.css

Behavior

The warning appears when rendering Markdown that includes a code block with the default jpro-mdfx styling.
If I explicitly define these CSS properties in my application stylesheet, the warnings disappear:

* {
    /* ... */
    -mdfx-code-block-border: /* My color */;
    -mdfx-code-block-background: /* My color */;
}

Expected behavior

MarkdownView should not emit JavaFX CSS warnings with its default stylesheet/settings. If these properties are required for code block rendering, it would be helpful if jpro-mdfx provided safe default values.

Actual behavior

Without explicitly setting -mdfx-code-block-border and -mdfx-code-block-background, JavaFX logs a ClassCastException warning.

[FlorianKirmaier]

Thank you for reporting this.
I'll soon take the time for both of your tickets.