Regression: v3.4.15 hoists the linear-gradient background to the top

[ngyikp]

Input:

.abc {
    background: #fff;
    background-image: url(a.png), -webkit-linear-gradient(top, #000, #111);
    background-image: url(a.png), -moz-linear-gradient(top, #000, #111);
    background-image: url(a.png), -o-linear-gradient(top, #000, #111);
    background-image: url(a.png), linear-gradient(to bottom, #000, #111);
}

3.4.14 is pretty much the same:

.abc {
    background: #fff;
    background-image: url(a.png), -webkit-linear-gradient(top, #000, #111);
    background-image: url(a.png), -moz-linear-gradient(top, #000, #111);
    background-image: url(a.png), -o-linear-gradient(top, #000, #111);
    background-image: url(a.png), linear-gradient(to bottom, #000, #111)
}

3.4.15 hoists the linear-gradient to the background shorthand, which doesn't work for browsers that don't support it:

.abc {
    background: url(a.png), linear-gradient(to bottom, #000, #111) #fff;
    background-image: url(a.png), -webkit-linear-gradient(top, #000, #111);
    background-image: url(a.png), -moz-linear-gradient(top, #000, #111);
    background-image: url(a.png), -o-linear-gradient(top, #000, #111)
}

[jakubpawlowicz]

It's released in 3.4.16.