[Breeze] [Bug 407938] New: Icon resource file rcc is two times bigger on MacOS than on MS Windows

[NSLW]

https://bugs.kde.org/show_bug.cgi?id=407938

            Bug ID: 407938
           Summary: Icon resource file rcc is two times bigger on MacOS
                    than on MS Windows
           Product: Breeze
           Version: 5.15.90
          Platform: Compiled Sources
                OS: macOS
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Icons
          Assignee: visual-design at kde.org
          Reporter: lukasz.wojnilowicz at gmail.com
                CC: faure at kde.org, kainz.a at gmail.com
  Target Milestone: ---

SUMMARY
Compiling breeze icons on different operating systems as binary resource
procudes files that differ significantly in size.

STEPS TO REPRODUCE
1. Download
http://download.kde.org/stable/frameworks/5.58/breeze-icons-5.58.0.tar.xz
2. Compile with BINARY_ICONS_RESOURCE=ON
3. Do above on MacOS and MS Windows
4. Compare size of resultant breeze-icons.rcc file

OBSERVED RESULT
breeze-icons.rcc is 7.6 MB on MS Windows
breeze-icons.rcc is 19.3 MB on MacOS

EXPECTED RESULT
Size of breeze-icons.rcc should be equal on all operating systems

SOFTWARE/OS VERSIONS
Windows: 7, msys
macOS: 10.13, clang


ADDITIONAL INFORMATION
I think rcc file on MacOS contains duplicated data, eg.
In <BUILD_DIR>/icons/res/actions
there are two directories named:
"16" and "16 at 2x"
whereas on MS Windows there is only one directory named:
"16"
On MacOS "16" and "16 at 2x" have equal size, so they contain the same data.

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