New function check_minibuf_window to fix bug#15183.

* frame.c (check_minibuf_window): New function.
(delete_frame, Fmake_frame_invisible, Ficonify_frame): Call
check_minibuf_window (Bug#15183).

2 files changed, 55 insertions, 32 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 6408397c13e..a017eaa62f0 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,9 @@
+2013-08-26  Martin Rudalics  <rudalics@gmx.at>
+
+        * frame.c (check_minibuf_window): New function.
+        (delete_frame, Fmake_frame_invisible, Ficonify_frame): Call
+        check_minibuf_window (Bug#15183).
+
 2013-08-26  Dmitry Antipov  <dmantipov@yandex.ru>
 
         * window.h (struct window): Replace last_cursor with last_cursor_vpos
diff --git a/src/frame.c b/src/frame.c
index 5ee001f4d98..4855734c2fc 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -1110,6 +1110,51 @@ other_visible_frames (struct frame *f)
   return 0;
 }
 
+/* Make sure that minibuf_window doesn't refer to FRAME's minibuffer
+   window.  Preferably use the selected frame's minibuffer window
+   instead.  If the selected frame doesn't have one, get some other
+   frame's minibuffer window.  SELECT non-zero means select the new
+   minibuffer window.  */
+static void
+check_minibuf_window (Lisp_Object frame, int select)
+{
+  struct frame *f = decode_live_frame (frame);
+
+  if (WINDOWP (minibuf_window) && EQ (f->minibuffer_window, minibuf_window))
+    {
+      Lisp_Object frames, this, window;
+
+      if (!EQ (frame, selected_frame)
+          && FRAME_HAS_MINIBUF_P (XFRAME (selected_frame)))
+        window = FRAME_MINIBUF_WINDOW (XFRAME (selected_frame));
+      else
+        FOR_EACH_FRAME (frames, this)
+          {
+            if (!EQ (this, frame) && FRAME_HAS_MINIBUF_P (XFRAME (this)))
+              {
+                window = FRAME_MINIBUF_WINDOW (XFRAME (this));
+                break;
+              }
+          }
+
+      if (!WINDOWP (window))
+        emacs_abort ();
+      else
+        {
+          /* Use set_window_buffer instead of Fset_window_buffer (see
+             discussion of bug#11984, bug#12025, bug#12026).  */
+          set_window_buffer (window, XWINDOW (minibuf_window)->contents, 0, 0);
+          minibuf_window = window;
+
+          /* SELECT non-zero usually means that FRAME's minibuffer
+             window was selected; select the new one.  */
+          if (select)
+            Fselect_window (minibuf_window, Qnil);
+        }
+    }
+}
+
+
 /* Delete FRAME.  When FORCE equals Qnoelisp, delete FRAME
   unconditionally.  x_connection_closed and delete_terminal use
   this.  Any other value of FORCE implements the semantics
@@ -1244,19 +1289,7 @@ delete_frame (Lisp_Object frame, Lisp_Object force)
     }
 
   /* Don't allow minibuf_window to remain on a deleted frame.  */
-  if (EQ (f->minibuffer_window, minibuf_window))
-    {
-      /* Use set_window_buffer instead of Fset_window_buffer (see
-         discussion of bug#11984, bug#12025, bug#12026).  */
-      set_window_buffer (sf->minibuffer_window,
-                         XWINDOW (minibuf_window)->contents, 0, 0);
-      minibuf_window = sf->minibuffer_window;
-
-      /* If the dying minibuffer window was selected,
-         select the new one.  */
-      if (minibuffer_selected)
-        Fselect_window (minibuf_window, Qnil);
-    }
+  check_minibuf_window (frame, minibuffer_selected);
 
   /* Don't let echo_area_window to remain on a deleted frame.  */
   if (EQ (f->minibuffer_window, echo_area_window))
@@ -1683,16 +1716,8 @@ displayed in the terminal.  */)
   if (NILP (force) && !other_visible_frames (f))
     error ("Attempt to make invisible the sole visible or iconified frame");
 
-  /* Don't allow minibuf_window to remain on a deleted frame.  */
-  if (EQ (f->minibuffer_window, minibuf_window))
-    {
-      struct frame *sf = XFRAME (selected_frame);
-      /* Use set_window_buffer instead of Fset_window_buffer (see
-         discussion of bug#11984, bug#12025, bug#12026).  */
-      set_window_buffer (sf->minibuffer_window,
-                         XWINDOW (minibuf_window)->contents, 0, 0);
-      minibuf_window = sf->minibuffer_window;
-    }
+  /* Don't allow minibuf_window to remain on an invisible frame.  */
+  check_minibuf_window (frame, EQ (minibuf_window, selected_window));
 
   /* I think this should be done with a hook.  */
 #ifdef HAVE_WINDOW_SYSTEM
@@ -1715,15 +1740,7 @@ If omitted, FRAME defaults to the currently selected frame.  */)
   struct frame *f = decode_live_frame (frame);
 
   /* Don't allow minibuf_window to remain on an iconified frame.  */
-  if (EQ (f->minibuffer_window, minibuf_window))
-    {
-      struct frame *sf = XFRAME (selected_frame);
-      /* Use set_window_buffer instead of Fset_window_buffer (see
-         discussion of bug#11984, bug#12025, bug#12026).  */
-      set_window_buffer (sf->minibuffer_window,
-                         XWINDOW (minibuf_window)->contents, 0, 0);
-      minibuf_window = sf->minibuffer_window;
-    }
+  check_minibuf_window (frame, EQ (minibuf_window, selected_window));
 
   /* I think this should be done with a hook.  */
 #ifdef HAVE_WINDOW_SYSTEM