Duplicate rules being merged into one

There is an existing issue which seems to be related to my issue but the other one is specifically about the background rule, so I have opened a separate issue incase this needs to be handled differently.

clean-css appears to be removing duplicate CSS rules which are needed.

Take this:

display: -ms-flexbox;
-ms-flex-pack: center;
-ms-flex-align: center;
display: -moz-box;
-moz-box-pack: center;
-moz-box-align: center;
display: -webkit-box;
-webkit-box-pack: center;
-webkit-box-align: center;
display: box;
box-pack: center;
box-align: center;

Which is compressed to (new lines are my own):

-ms-flex-pack:center;
-ms-flex-align:center;
-moz-box-pack:center;
-moz-box-align:center;
-webkit-box-pack:center;
-webkit-box-align:center;
display:box;
box-pack:center;
box-align:center

How can I stop display: -moz-box; and display: -webkit-box; from being removed?

Edit: I should note that this has just started happening since I updated to the latest version, everything was fine before.

Thanks

[DevanB]

Ahhh, this is good to know. I may just jump to 4.0 on all projects. Thanks!

On Jan 25, 2017, at 09:27, Jakub Pawlowicz [e-mail] wrote:

Sorry to hear that. In 3.x you can disable it with { aggressiveMerging: false }. It’s entirely gone in 4.x being replaced by overriding based on understandability.

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[misam2ali]

Glad that this helped me fix a similar issue.