[Omake] Annoying spaces in sequence-to-string conversion

[David Kågedal]

This is a distilled testcase from one of my OMakefiles:

    mod = $(addprefix MOD:,test)
    println(mod = >>$(mod)<<)
    XX = $(string MODNAME=\"$(mod)\")
    YY = $(string MODNAME=\"$(string $(mod))\")
    println(XX = >>$(XX)<<)
    println(YY = >>$(YY)<<)

The output looks like this:

    mod = >>MOD:test<<
    XX = >>MODNAME=" MOD:test "<<
    YY = >>MODNAME="MOD:test"<<

As you can see, there are two spaces added to the XX case which seem
rather surprising (and annoying) to me.

In my case, I can easily fix it, since the addprefix call should
probably be something else.  But I'm trying to understand if this is
really the intended behaviour.  It seems to be a consequence of the
fact that addprefix returns a sequence.  The strange thing is that
when that is converted to a string in the first println call, it does
not add any spaces, but when it is converted using $(string), the
strings are added.

-- 
David Kågedal, Virtutech