D13062: Don't manipulate foreign windows

[Kai Uwe Broulik]

broulik created this revision.
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TEST PLAN
  I noticed that Chrome's window had the property
  
    _KDE_NET_WM_DESKTOP_FILE(UTF8_STRING) = "org.kde.kdialog"
  
  and it uses `kdialog --attach` for a Save As dialog with proper parent dimming
  
  - Attached `kdialog` to another window, it never got its desktop file name forcefully changed to that.

REPOSITORY
  R135 Integration for Qt applications in Plasma

REVISION DETAIL
  https://phabricator.kde.org/D13062

AFFECTED FILES
  src/platformtheme/x11integration.cpp

To: broulik, #plasma
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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