Reduce delay between backing up a file and saving new version

* lisp/files.el (basic-save-buffer-2):
Choose coding system for writing the file before backing it up.

* src/fileio.c (choose_write_coding_system): Make it callable from Lisp.
(Fwrite_region): If coding-system-for-write is set, don't call
choose_write_coding_system.
Move the last piece of choose_write_coding_system here.
(syms_of_fileio): Add choose-write-coding-system.

Fixes: debbugs:13522

1 files changed, 8 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index bb03ba10bb0..08eb9b50a9b 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,11 @@
+2013-01-31  Glenn Morris  <rgm@gnu.org>
+
+        * fileio.c (choose_write_coding_system): Make it callable from Lisp.
+        (Fwrite_region): If coding-system-for-write is set, don't
+        call choose_write_coding_system.  Move the last piece of
+        choose_write_coding_system here.  (Bug#13522)
+        (syms_of_fileio): Add choose-write-coding-system.
+
 2013-01-30  Eli Zaretskii  <eliz@gnu.org>
 
         * w32.c (sys_open): Zero out the flags for the new file descriptor.