* xdisp.c (message): If M is zero, clear echo_area_glyphs and

	previous_echo_glyphs, so that the minibuffer shows through.

diff --git a/src/xdisp.c b/src/xdisp.c
index a44f988..eb78d11 100644 (file)
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -171,21 +171,24 @@ int windows_or_buffers_changed;
    zero if being used by message.  */
 int message_buf_print;
 
-/* dump an informative message to the minibuf */
+/* Dump an informative message to the minibuf.  If m is 0, clear out
+   any existing message, and let the minibuffer text show through.  */
 /* VARARGS 1 */
-
 void
 message (m, a1, a2, a3)
      char *m;
 {
   if (noninteractive)
     {
-      if (noninteractive_need_newline)
-       putc ('\n', stderr);
-      noninteractive_need_newline = 0;
-      fprintf (stderr, m, a1, a2, a3);
-      fprintf (stderr, "\n");
-      fflush (stderr);
+      if (m)
+       {
+         if (noninteractive_need_newline)
+           putc ('\n', stderr);
+         noninteractive_need_newline = 0;
+         fprintf (stderr, m, a1, a2, a3);
+         fprintf (stderr, "\n");
+         fflush (stderr);
+       }
     }
   /* A null message buffer means that the frame hasn't really been
      initialized yet.  Error messages get reported properly by
@@ -202,22 +205,27 @@ message (m, a1, a2, a3)
        Fmake_frame_visible (WINDOW_FRAME (XWINDOW (minibuf_window)));
 #endif
 
-      {
+      if (m)
+       {
+         {
 #ifdef NO_ARG_ARRAY
-       int a[3];
-       a[0] = a1;
-       a[1] = a2;
-       a[2] = a3;
+           int a[3];
+           a[0] = a1;
+           a[1] = a2;
+           a[2] = a3;
 
-       doprnt (FRAME_MESSAGE_BUF (selected_frame),
-               FRAME_WIDTH (selected_frame), m, 0, 3, a);
+           doprnt (FRAME_MESSAGE_BUF (selected_frame),
+                   FRAME_WIDTH (selected_frame), m, 0, 3, a);
 #else
-       doprnt (FRAME_MESSAGE_BUF (selected_frame),
-               FRAME_WIDTH (selected_frame), m, 0, 3, &a1);
+           doprnt (FRAME_MESSAGE_BUF (selected_frame),
+                   FRAME_WIDTH (selected_frame), m, 0, 3, &a1);
 #endif                         /* NO_ARG_ARRAY */
-      }
+         }
 
-      echo_area_glyphs = FRAME_MESSAGE_BUF (selected_frame);
+         echo_area_glyphs = FRAME_MESSAGE_BUF (selected_frame);
+       }
+      else
+       echo_area_glyphs = previous_echo_glyphs = 0;
 
       /* Print should start at the beginning of the message
         buffer next time.  */