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Implement clipboard manager

Carlos Garnacho requested to merge wip/carlosg/clipboard-manager into master

This branch gets a few things going:

  • Generic API has been added for selections, with implementations in src/x11 and src/wayland. It's now all based on GInputStream/GOutputStream, so transfers between different selection types are generic on the high level.
  • Now that src/wayland/meta-xwayland-selection.c got a bunch of its responsibilities taken away, it could be simplified so that it just handles DnD messaging.
  • A simple memory based selection source was added, and a clipboard manager implementation on top of it. The implementation is somewhat simple and the x11 side of it doesn't quite follow https://www.freedesktop.org/wiki/ClipboardManager/ (it simply inspects the clipboard after every owner change), but it may work on both x11 and wayland. Just text is stored, which covers 99% of the usecases.
  • Part of the API was made public, so that StClipboard could be ditched or reimplemented on top. (one less fixed x11 usage \o/)

This also could allow simplifying meta-wayland-data-device.c, as MetaWaylandDataSource is more for DnD. I plan to split the DnD bits into a separate object, which clipboard/primary don't strictly require, but I stopped shy of doing that (rather, got a mess in my stash :).

This also takes over gsd-clipboard functionality and allows to simply remove it.

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