Don't run buffer-related hooks in " *code conversion work*" buffers

Note: portions of this change were mistakenly pushed as part
of an unrelated commit a35a1f6a9.

* src/buffer.c (Fget_buffer_create): Set inhibit_buffer_hooks
non-zero for temporary buffers created by coding.c.  Don't run
buffer-list-update-hook for such buffers.
(Frename_buffer, Fkill_buffer, record_buffer)
(Fbury_buffer_internal): Don't run hooks for buffers whose
inhibit_buffer_hooks flag is set.
* src/buffer.h (struct buffer): New member
inhibit_buffer_hooks.
* src/pdumper.c (dump_buffer): Dump the new field.  Update the
hash value in HASH_buffer_XXX.
* src/coding.c (make_conversion_work_buffer): Function deleted;
code moved to code_conversion_save.
(code_conversion_save): Insert code from
make_conversion_work_buffer, but arrange for unwind-protecting
the current buffer before switching to the work buffer.  This
avoids leaving reused_workbuf_in_use set if user presses C-g
during encoding/decoding.
(Vcode_conversion_workbuf_name): Now external variable.
* src/coding.h (Vcode_conversion_reused_workbuf): Declare.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/buffer.h b/src/buffer.h
index d3528ac50e9..63b162161c6 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -855,6 +855,13 @@ struct buffer
   /* Non-zero whenever the narrowing is changed in this buffer.  */
   bool_bf clip_changed : 1;
 
+  /* Non-zero for internally used temporary buffers that don't need to
+     run hooks kill-buffer-hook, buffer-list-update-hook, and
+     kill-buffer-query-functions.  This is used in coding.c to avoid
+     slowing down en/decoding when there are a lot of these hooks
+     defined.  */
+  bool_bf inhibit_buffer_hooks : 1;
+
   /* List of overlays that end at or before the current center,
      in order of end-position.  */
   struct Lisp_Overlay *overlays_before;