D6418: [XDGV6] manage every ping sent

[Marco Martin]

mart created this revision.
Restricted Application added projects: Plasma on Wayland, Frameworks.
Restricted Application added subscribers: Frameworks, plasma-devel.

REVISION SUMMARY
  if more ping arrives before a pong, store each of its
  serial and manage them one by one
  
  a new signal, pingTimeout emitted until explicitly stopped

TEST PLAN
  tests still pass, kwin modified to use it on window close
  and window focus gain works correctly.
  What is not tested: apps not answering to pings
  as usually the connection thread will still be
  running, so something to actually query the gui
  thread will be needed

REPOSITORY
  R127 KWayland

BRANCH
  mart/xdgv6ping

REVISION DETAIL
  https://phabricator.kde.org/D6418

AFFECTED FILES
  autotests/client/test_xdg_shell.cpp
  src/server/xdgshell_interface.cpp
  src/server/xdgshell_interface.h
  src/server/xdgshell_interface_p.h
  src/server/xdgshell_v5_interface.cpp
  src/server/xdgshell_v6_interface.cpp

To: mart, #plasma, davidedmundson, graesslin
Cc: plasma-devel, #frameworks, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, eliasp, sebas, apol, mart, hein, lukas
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