[Breeze] [Bug 425434] New: Applications using Qt CSD have no outer shadow

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https://bugs.kde.org/show_bug.cgi?id=425434

            Bug ID: 425434
           Summary: Applications using Qt CSD have no outer shadow
           Product: Breeze
           Version: 5.19.4
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: window decoration
          Assignee: unassigned-bugs at kde.org
          Reporter: public at redaril.me
  Target Milestone: ---

SUMMARY
Telegram uses this library: https://github.com/lirios/materialdecoration
Telegram is a Qt-based application. Recently, it included materialdecoration on
Linux which enabled CSD. This makes Telegram have no outer shadow exactly like
Plasma used to do with GTK3 applications not so long ago.

STEPS TO REPRODUCE
1. Install a recent version of Telegram (say 2.2)
2. Run it

OBSERVED RESULT
The application window has no shadow.

EXPECTED RESULT
The application window should have an outer shadow like all the other Qt-based
applications.

SOFTWARE/OS VERSIONS
Operating System: Solus 4.1
KDE Plasma Version: 5.19.4
KDE Frameworks Version: 5.72.0
Qt Version: 5.14.2
Kernel Version: 5.6.19-158.current
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-2600K CPU @ 3.40GHz
Memory: 15.6 GiB of RAM
Graphics Processor: AMD Radeon R9 200 Series

ADDITIONAL INFORMATION

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