Keep track of clipboard ownership

Given that all clipboard handling is async, it is possible to for
example receive a request for clipboard data from the agent
while the client no longer owns the clipboard (ie a
VD_AGENT_CLIPBOARD_RELEASE message is in transit to the agent).

Thus it is necessary to keep track of our notion of clipboard ownership
and check received clipboard messages (both from other apps on the client
machine and from the agent) to see if they match our notion and if not
drop, or in case were a counter message is expected nack the clipboard
message.

1 files changed, 1 insertions, 0 deletions

diff --git a/client/red_client.h b/client/red_client.h
index 2cfce494..15f06170 100644
--- a/client/red_client.h
+++ b/client/red_client.h
@@ -221,6 +221,7 @@ public:
     void on_clipboard_grab(uint32_t *types, uint32_t type_count);
     void on_clipboard_request(uint32_t type);
     void on_clipboard_notify(uint32_t type, uint8_t* data, int32_t size);
+    void on_clipboard_release();
 
     void for_each_channel(ForEachChannelFunc& func);
     void on_mouse_capture_trigger(RedScreen& screen);