Add a new capability VD_AGENT_CAP_CLIPBOARD_SELECTION.
When both client and servers have this capability, the
VDAgentClipboard* messages MUST be prepended with a uint8_t indicating
which clipboard selection to operate + 3 bytes stuffing for alignment
that could be used for future capabilities or extensions.
A few clipboard selection are defined according to X11/Gtk scheme:
- VD_AGENT_CLIPBOARD_SELECTION_CLIPBOARD: the default clipboard,
implemented by most OS to deal with explicit Copy/Paste operations.
- VD_AGENT_CLIPBOARD_SELECTION_PRIMARY: the PRIMARY clipboard, used
for mouse selections.
- VD_AGENT_CLIPBOARD_SELECTION_SECONDARY: the SECONDARY clipboard.
See also:
http://www.freedesktop.org/wiki/Specifications/ClipboardsWikihttps://bugs.freedesktop.org/show_bug.cgi?id=34833
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