Speed up handling X selection requests

* etc/NEWS: Announce speedup.
* src/alloc.c (garbage_collect): Call mark_xselect.
* src/xftfont.c (xftfont_end_for_frame): Fix crash on display IO
error.
* src/xselect.c (struct selection_data, struct transfer): New
structures.
(outstading_transfers): New variable.
(SELECTED_EVENTS, x_selection_request_lisp_error): Stop checking
cs->nofree.
(x_catch_errors_unwind): Delete function.
(c_size_for_format, x_size_for_format, selection_data_for_offset)
(selection_data_size, transfer_selecting_event)
(x_continue_selection_transfer, x_remove_selection_transfers)
(x_selection_transfer_timeout): New functions.
(x_reply_selection_request): When handling selection requests,
never wait for property notifications synchronously.  Instead,
write out the selection data as the client reads it from the
event loop.
(x_handle_selection_request, x_convert_selection)
(x_handle_property_notify, x_get_window_property)
(lisp_data_to_selection_data): Don't ever use pointers to Lisp
string data! Instead, just store the string object itself.
(syms_of_xselect): Initialize outstanding transfer list.
(syms_of_xselect_for_pdumper):
* src/xterm.c (x_delete_display): Remove outstanding selection
transfers.
* src/xterm.h: Update prototypes.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/alloc.c b/src/alloc.c
index ff8b4b40aaa..e443acd72fa 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -6220,6 +6220,7 @@ garbage_collect (void)
 
 #ifdef HAVE_X_WINDOWS
   mark_xterm ();
+  mark_xselect ();
 #endif
 
 #ifdef HAVE_NS