change to readline callback signal handling; fix message when popping shell function context; handle new terminating signals inside terminating signal handler; fix to pattern substitution with null replacement and null string; fix to alias expansion when we get a SIGINT while entering a command substitution in an interactive shell

lib/readline/callback.c

@@ -115,7 +115,10 @@ rl_callback_handler_install (const char *prompt, rl_vcpfunc_t *linefunc)
 #define CALLBACK_READ_RETURN() \
   do { \
     if (rl_persistent_signal_handlers == 0) \
-      rl_clear_signals (); \
+      { \
+	rl_clear_signals (); \
+	if (_rl_caught_signal) _rl_signal_handler (_rl_caught_signal); \
+      } \
     return; \
   } while (0)
 #else