* src/xdisp.c: Bind inhibit-quit during pre-redisplay-function.

(safe__call, safe__call1, safe__eval): New functions.
(safe_call): Use it.
(prepare_menu_bars): Use it for pre-redisplay-function.
(display_mode_element): Same for `:eval'.

Fixes: debbugs:17577

src/ChangeLog

+2014-05-24  Stefan Monnier  <monnier@iro.umontreal.ca>
+
+	* xdisp.c: Bind inhibit-quit during pre-redisplay-function.
+	(safe__call, safe__call1, safe__eval): New functions.
+	(safe_call): Use it.
+	(prepare_menu_bars): Use it for pre-redisplay-function (bug#17577).
+	(display_mode_element): Same for `:eval'.
+
 2014-05-22  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Fix port to 32-bit AIX (Bug#17540).

src/xdisp.c

@@ -2591,8 +2591,8 @@ safe_eval_handler (Lisp_Object arg, ptrdiff_t nargs, Lisp_Object *args)
    following.  Return the result, or nil if something went
    wrong.  Prevent redisplay during the evaluation.  */
-Lisp_Object
-safe_call (ptrdiff_t nargs, Lisp_Object func, ...)
+static Lisp_Object
+safe__call (bool inhibit_quit, ptrdiff_t nargs, Lisp_Object func, ...)
 {
   Lisp_Object val;
@@ -2615,6 +2615,8 @@ safe_call (ptrdiff_t nargs, Lisp_Object func, ...)
       GCPRO1 (args[0]);
       gcpro1.nvars = nargs;
       specbind (Qinhibit_redisplay, Qt);
+      if (inhibit_quit)
+	specbind (Qinhibit_quit, Qt);
       /* Use Qt to ensure debugger does not run,
 	 so there is no possibility of wanting to redisplay.  */
       val = internal_condition_case_n (Ffuncall, nargs, args, Qt,
@@ -2626,6 +2628,11 @@ safe_call (ptrdiff_t nargs, Lisp_Object func, ...)
   return val;
 }
+Lisp_Object
+safe_call (ptrdiff_t nargs, Lisp_Object func, ...)
+{
+  return safe__call (false, nargs, func);
+}
 /* Call function FN with one argument ARG.
    Return the result, or nil if something went wrong.  */
@@ -2633,7 +2640,13 @@ safe_call (ptrdiff_t nargs, Lisp_Object func, ...)
 Lisp_Object
 safe_call1 (Lisp_Object fn, Lisp_Object arg)
 {
-  return safe_call (2, fn, arg);
+  return safe__call (false, 2, fn, arg);
+}
+
+Lisp_Object
+safe__call1 (bool inhibit_quit, Lisp_Object fn, Lisp_Object arg)
+{
+  return safe__call (inhibit_quit, 2, fn, arg);
 }
 static Lisp_Object Qeval;
@@ -2641,7 +2654,13 @@ static Lisp_Object Qeval;
 Lisp_Object
 safe_eval (Lisp_Object sexpr)
 {
-  return safe_call1 (Qeval, sexpr);
+  return safe__call1 (false, Qeval, sexpr);
+}
+
+Lisp_Object
+safe__eval (bool inhibit_quit, Lisp_Object sexpr)
+{
+  return safe__call1 (inhibit_quit, Qeval, sexpr);
 }
 /* Call function FN with two arguments ARG1 and ARG2.
@@ -11549,7 +11568,7 @@ prepare_menu_bars (void)
 		}
 	    }
 	}
-      safe_call1 (Vpre_redisplay_function, windows);
+      safe__call1 (true, Vpre_redisplay_function, windows);
     }
   /* Update all frame titles based on their buffer names, etc.  We do
@@ -21863,7 +21882,7 @@ display_mode_element (struct it *it, int depth, int field_width, int precision,
 	    if (CONSP (XCDR (elt)))
 	      {
 		Lisp_Object spec;
-		spec = safe_eval (XCAR (XCDR (elt)));
+		spec = safe__eval (true, XCAR (XCDR (elt)));
 		n += display_mode_element (it, depth, field_width - n,
 					   precision - n, spec, props,
 					   risky);