Don't let unusual after-change-functions overwrite " prin1" buffer in use.

[bpt/emacs.git] / src / doc.c

diff --git a/src/doc.c b/src/doc.c
index d3f8fde..b6f1569 100644 (file)
--- a/src/doc.c
+++ b/src/doc.c
@@ -850,6 +850,7 @@ Otherwise, return a new string, without any text properties.  */)
          /* This is for computing the SHADOWS arg for describe_map_tree.  */
          Lisp_Object active_maps = Fcurrent_active_maps (Qnil, Qnil);
          Lisp_Object earlier_maps;
+         ptrdiff_t count = SPECPDL_INDEX ();
 
          changed = 1;
          strp += 2;            /* skip \{ or \< */
@@ -886,6 +887,10 @@ Otherwise, return a new string, without any text properties.  */)
          /* Now switch to a temp buffer.  */
          oldbuf = current_buffer;
          set_buffer_internal (XBUFFER (Vprin1_to_string_buffer));
+         /* This is for an unusual case where some after-change
+            function uses 'format' or 'prin1' or something else that
+            will thrash Vprin1_to_string_buffer we are using.  */
+         specbind (Qinhibit_modification_hooks, Qt);
 
          if (NILP (tem))
            {
@@ -910,6 +915,7 @@ Otherwise, return a new string, without any text properties.  */)
          tem = Fbuffer_string ();
          Ferase_buffer ();
          set_buffer_internal (oldbuf);
+         unbind_to (count, Qnil);
 
        subst_string:
          start = SDATA (tem);