* lisp/mpc.el (mpc--proc-filter): Don't signal mpc-proc-error since signals

from process filters aren't reliably transmitted to the surrounding
accept-process-output.
(mpc-proc-check): New function.
(mpc-proc-sync): Use it

Fixes: debbugs:8293

1 files changed, 3 insertions, 0 deletions

diff --git a/src/process.c b/src/process.c
index 2125478907f..977cfb964e2 100644
--- a/src/process.c
+++ b/src/process.c
@@ -5186,6 +5186,9 @@ read_process_output (Lisp_Object proc, register int channel)
           p->decoding_carryover = coding->carryover_bytes;
         }
       if (SBYTES (text) > 0)
+        /* FIXME: It's wrong to wrap or not based on debug-on-error, and
+           sometimes it's simply wrong to wrap (e.g. when called from
+           accept-process-output).  */
         internal_condition_case_1 (read_process_output_call,
                                    Fcons (outstream,
                                           Fcons (proc, Fcons (text, Qnil))),