hasUnit function
Check if a size has a CSS unit
Implementation
bool hasUnit(String size) {
return size == "auto" ||
size.endsWith("%") ||
size.endsWith("ch") ||
size.endsWith("cm") ||
size.endsWith("em") ||
size.endsWith("ex") ||
size.endsWith("in") ||
size.endsWith("mm") ||
size.endsWith("pc") ||
size.endsWith("pt") ||
size.endsWith("px") ||
size.endsWith("rem") ||
size.endsWith("vh") ||
size.endsWith("vmax") ||
size.endsWith("vmin") ||
size.endsWith("vw");
}