emacs-27 d1e8ce8: Make after-change-functions called from call-process get the correct BEG

[Alan Mackenzie]

branch: emacs-27
commit d1e8ce8bb6fadf3d034ae437ff1c1b81be7d5209
Author: Alan Mackenzie <address@hidden>
Commit: Alan Mackenzie <address@hidden>

    Make after-change-functions called from call-process get the correct BEG
    
    This fixes bug #39585.
    
    * src/callproc.c (call_process): Supply the correct CHARPOS to
    signal_after_change (twice).
---
 src/callproc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/callproc.c b/src/callproc.c
index 07dcc4c..8883415 100644
--- a/src/callproc.c
+++ b/src/callproc.c
@@ -811,7 +811,7 @@ call_process (ptrdiff_t nargs, Lisp_Object *args, int 
filefd,
                   && ! CODING_MAY_REQUIRE_DECODING (&process_coding))
             {
               insert_1_both (buf, nread, nread, 0, 0, 0);
-              signal_after_change (PT, 0, nread);
+              signal_after_change (PT - nread, 0, nread);
             }
          else
            {                   /* We have to decode the input.  */
@@ -854,7 +854,8 @@ call_process (ptrdiff_t nargs, Lisp_Object *args, int 
filefd,
 
              TEMP_SET_PT_BOTH (PT + process_coding.produced_char,
                                PT_BYTE + process_coding.produced);
-              signal_after_change (PT, 0, process_coding.produced_char);
+              signal_after_change (PT - process_coding.produced_char,
+                                   0, process_coding.produced_char);
              carryover = process_coding.carryover_bytes;
              if (carryover > 0)
                memcpy (buf, process_coding.carryover,