D29332: [xwl] Update to kwaylandserver changes

davidedmundson created this revision.
davidedmundson added a reviewer: KWin.
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REVISION SUMMARY
  Change so we track track and set a DataSource instead of a DataDevice
  
  This means we have to reverse a connection:
  
  - we need to update Seat with our selection only when our selection is
  
  received by the DataDeviceInterface
  
  - we no longer need to track and watch a dataDevice for changes after
  
  the seat emits selectionChange
  
  Change so that we handle an AbstractDataSource. Meaning we can paste
  from clipboard managers.
  
  Testing done:
  There is an existing xwayland-selections_test
  This still passes.
  
  Copied from:
  wl-copy(wlr) to firefox (x)
  firefox to wl-paste
  firefox to kate (wayland)
  kate to firefox

REPOSITORY
  R108 KWin

BRANCH
  xwl_update

REVISION DETAIL
  https://phabricator.kde.org/D29332

AFFECTED FILES
  xwl/clipboard.cpp
  xwl/clipboard.h
  xwl/dnd.cpp
  xwl/selection_source.cpp
  xwl/selection_source.h

To: davidedmundson, #kwin
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