Fix processing sub-process exit when keyboard input is pending

* src/process.c (wait_reading_process_output): Process status
changes of sub-processes when called with read_kbd zero and some
"keyboard input" is available, but no output from any sub-process.
(Bug#79777)

1 files changed, 12 insertions, 0 deletions

diff --git a/src/process.c b/src/process.c
index 86e83e58c56..3d4ecb82b08 100644
--- a/src/process.c
+++ b/src/process.c
@@ -5844,6 +5844,18 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
 
       if (nfds == 0)
         {
+          if (!read_kbd && update_tick != process_tick)
+            {
+              /* This is for the case where we bypassed a similar call
+                 above, after the first thread_select, because some
+                 input was available, but later found in the second
+                 thread_select that input was only "from keyboard",
+                 which we need to ignore because we were called with
+                 read_kbd zero.  We should therefore process the changed
+                 status of sub-processes.  */
+              got_some_output = status_notify (NULL, wait_proc);
+              if (do_display) redisplay_preserve_echo_area (113);
+            }
           /* Exit the main loop if we've passed the requested timeout,
              or have read some bytes from our wait_proc (either directly
              in this call or indirectly through timers / process filters),