Specifying icon size in "em" is not working about ikonli

[dlemmermann]

If you want to try it yourself simply clone my "GemsFX" project and run TagFieldApp after changing this rule:

.tags-field .graphic-wrapper .ikonli-font-icon {
    -fx-icon-size: 1.0em;
    -fx-icon-color: -fx-text-background-color;
}

[aalmiray]

FontIcon can only handle sizes in pixels at the moment

ikonli/core/ikonli-javafx/src/main/java/org/kordamp/ikonli/javafx/FontIcon.java

Lines 130 to 136 in f73e0aa

	iconSize.addListener((v, o, n) -> {
	Font font = FontIcon.this.getFont();
	if (Math.abs(font.getSize() - n.doubleValue()) >= EPSILON) {
	FontIcon.this.setFont(Font.font(font.getFamily(), n.doubleValue()));
	FontIcon.this.setStyle(normalizeStyle(getStyle(), "-fx-font-size", n.intValue() + "px"));
	}
	});

[mkpaz]

I think it's a bug and the problem is here:

FontIcon.this.setFont(Font.font(font.getFamily(), n.doubleValue())); 
FontIcon.this.setStyle(normalizeStyle(getStyle(), "-fx-font-size", n.intValue() + "px")); 

It's sets the font size twice and the second line forces size listener to call itself recursively. Just removing it is enough to fix the issue, because iconSize styleable property already uses SizeConverter which is capable to parse all supported SizeUnits including em.

To workaround this simply extend FontIcon and remove this line. Seems like everything works to me.