Properties lost with UglifyJsPlugin after upgrading to 0.15.5

[gpbl]

I upgraded from 0.14.5 to 0.15.5 and I've found some parts of my styles not working correctly. Trying to isolate the problem, I've seen for example that this source:

.Swipe {
  position: relative;
  user-select: none;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.Swipe-container {
  overflow: hidden;
  visibility: hidden;
  position: relative;
}

.Swipe-wrapper {
  overflow: hidden;
  position: relative;
}

.Swipe-child {
  float: left;
  width: 100%;
  position: relative;
}

...after being auto-prefixed, get minified as

.Swipe {
    position: relative;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%
}

.Swipe-container {
    visibility: hidden
}

.Swipe-container,.Swipe-wrapper {
    overflow: hidden;
    position: relative
}

.Swipe-child {
    float: left;
    width: 100%
}
/*# sourceMappingURL=main-131e2e34531d647cdb93.css.map*/

(the minified version has been re-indented with chrome dev tools)

Note how the .Swipe-child selector has lost its position: relative. The property stays if I remove .Swipe-container,.Swipe-wrapper block.

Does anybody else have this kind of issues? Maybe it is related to #89 and #94.

[EvHaus]

I'm having the same problem. A bunch of CSS attributes are getting stripped out when running through Uglify. I'm using css?-restructuring as the loader, so I'm expecting no restructuring to occur, but that option seems to be ignored in 0.15.x.

[EvHaus]

According to this issue: clean-css/clean-css#318 the solution is to disable aggressive merging, but I cannot for the life of me figure out how to do this in css-loader. I've tried all of these, but none of them seem to work:

loader: 'style!css?-restructuring&aggressiveMerging'
loader: 'style!css?-restructuring&-aggressiveMerging'
loader: 'style!css?-restructuring&noAggressiveMerging'
loader: 'style!css?-restructuring&-noAggressiveMerging'
loader: 'style!css?-restructuring&skip-aggressive-merging'
loader: 'style!css?-restructuring&-skip-aggressive-merging'

The option definition is webpack is definitely confusing. I have no idea why it's not working and I have no way to check which options are enabled.

[SpaceK33z]

This has been fixed in webpack v2. Also see webpack/webpack#666.