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Fix z-index rebase #3930
z-index values rebased in build styles in Gutenberg 1.9.0
The issue seems to be a regression from version 1.8.1 caused by introduction of webpack-rtl-plugin. This plugin is using cssnano which has a default option set to rebase z-index values http://cssnano.co/optimisations/zindex/
webpack-rtl-plugin accepts configuration for minifying which are passed to cssnano as options. I'm setting the safe:true which will disable z-index rebase.
Also reported here #3897