Fail restructuring similar blocks

[silentroach]

Input:

.support-question .closed {
    background: url('/s/a/i/ic/util.gif') no-repeat transparent top right;
    background-position: right -65px;
    white-space: nowrap;
    padding-right: 15px;
}
.support-question .opened {
    background: url('/s/a/i/ic/util.gif') no-repeat transparent top right;
    background-position: right -450px;
    white-space: nowrap;
    padding-right: 15px;
}

After CSSO:

.support-question .closed {
    background-position:right -65px
}
.support-question .closed, .support-question .opened {
    background:url('/s/a/i/ic/util.gif') no-repeat top right;
    white-space:nowrap;
    padding-right:15px
}
.support-question .opened {
    background-position:right -450px
}

Position for closed is overriden with default values :{

[silentroach]

Something like this:

.pages {
    background-size: cover;
}
#slide-01 {
    background: url(lalala.png) no-repeat;
    background-size: cover;
}

output:

.pages, #slide-01{
    background-size:cover
}

#slide-01{
    background:url(lalala.png) no-repeat
}

background-size is overriden with default value

[silentroach]

Bye, csso

[magnars]

@silentroach What are you using instead? This project looks quite dead.

[tadatuta]

@magnars that's true :(
suggest to switch to https://github.com/jakubpawlowicz/clean-css

[silentroach]

Very sad, csso idea is great

[tadatuta]

@silentroach yeah, but nowadays structural optimisations are quite common idea

[silentroach]

new hope!

[lahmatiy]

It's similar to #143, but examples could be useful for tests.

[lahmatiy]

Current output for first example:

.support-question .closed,.support-question .opened {
    background: url('/s/a/i/ic/util.gif') no-repeat top right;
    white-space: nowrap;
    padding-right: 15px
}

.support-question .closed {
    background-position: right -65px
}

.support-question .opened {
    background-position: right -450px
}

It's correct. But because of good enough declaration positions.
Second example is still fail...

[ArturAralin]

What about second example, it's even possible without context?
How csso can know which block is encapsulates other?