Whitespace preservation in LESS escaping for calc operands in CSS3

Question

I would like to express the following CSS in LESS:

.a {
    min-height: calc(2em + 4px);
}

So, in order to prevent LESS from attempting a c

Answer 1

This is kind of an old post but I wanted to show you a simple mathematic workaround for this.

I also have this issue with my minifying engine. Mine works fine with substraction but remove whitespace in addition. If someone have the same problem, this is the simplest workaround.

If you want this:

.a {
    min-height: ~'calc(2em + 4px)';
}

Write it as this instead:

.a {
    min-height: ~'calc(2em - -4px)';
}