#276: prevent loops leading to deadlocks:

* send clipboard token via idle_add - giving enough time for the main loop to run
* "block owner change" when we claim the clipboard

git-svn-id: https://xpra.org/svn/Xpra/trunk@14704 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/clipboard/clipboard_base.py

@@ -232,6 +232,11 @@ def _clipboard_got_contents(self, request_id, dtype, dformat, data):
         loop.done({"type": dtype, "format": dformat, "data": data})
 
     def _send_clipboard_token_handler(self, proxy):
+        #send via idle_add so the main loop can run
+        #(prevents tight clipboard loops from completely hogging the main loop)
+        gobject.idle_add(self.do_send_clipboard_token_handler, proxy)
+
+    def do_send_clipboard_token_handler(self, proxy):
         selection = proxy._selection
         log("send clipboard token: %s", selection)
         rsel = self.local_to_remote(selection)
@@ -676,10 +681,12 @@ def got_token(self, targets, target_data, claim):
             #not that they want to own the clipboard selection
             return
         self._have_token = True
-        if self._can_receive:
+        if self._can_receive and not self._block_owner_change:
             #if we don't claim the selection (can-receive=False),
             #we will have to send the token back on owner-change!
+            self._block_owner_change = True
             self.claim()
+            glib.idle_add(self.remove_block)
 
     def remove_block(self, *args):
         log("remove_block: %s", self._selection)