If you have 2 class declarations that are the same...
# tornadofx
d
If you have 2 class declarations that are the same, can you do a syntax like comma separation? Or is mixin the only way to share styles? The following 2 share the same implementation.
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incrementArrow {
    shape = " "
    padding = box(0.px)
}

decrementArrow {
    shape = " "
    padding = box(0.px)
}
In regular css, that could be
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incrementArrow, decrementArrow {
    shape = " "
    padding = box(0.px)
}
Implementing a mixin to share 2 rules, doesn't really reduce the number of lines in this instance.