D22755: [platforms/xcb] Use XRES extension to get real window PID

[David Edmundson]

davidedmundson created this revision.
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REVISION SUMMARY
  It's increasingly common for apps to be in their own PID namespace. If
  this is the case, they report a buggy NET_WM_PID on their windows as
  obviously they don't know their own PID.
  
  This patch uses the XResources extension to query the real PID instead
  of asking the window.
  
  This allows the task manager to know the real PID when doing lookups for
  matching services or showing pulseaudio badges.
  
  Querying the NET_WM_ATOM with the NETWM classes remains unchanged, so we
  still have access to all information should a system need it.
  
  BUG: 384837

TEST PLAN
  The relevant unit test KWindowInfo::testPid() still passes whilst using
  this new extension.

REPOSITORY
  R278 KWindowSystem

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D22755

AFFECTED FILES
  CMakeLists.txt
  src/platforms/xcb/CMakeLists.txt
  src/platforms/xcb/kwindowinfo.cpp
  src/platforms/xcb/kwindowinfo_p_x11.h

To: davidedmundson
Cc: kde-frameworks-devel, LeGast00n, sbergeron, michaelh, ngraham, bruns
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