(store_frame_param): Allow setting a frame's minibuffer

to the value that it already has.

diff --git a/src/frame.c b/src/frame.c
index a68aed3..27b74d5 100644 (file)
--- a/src/frame.c
+++ b/src/frame.c
@@ -1707,8 +1707,9 @@ store_frame_param (f, prop, val)
       if (! MINI_WINDOW_P (XWINDOW (val)))
        error ("Surrogate minibuffer windows must be minibuffer windows.");
 
-      if (FRAME_HAS_MINIBUF_P (f) || FRAME_MINIBUF_ONLY_P (f))
-       error ("can't change the surrogate minibuffer of a frame with its own minibuffer");
+      if (FRAME_HAS_MINIBUF_P (f) || FRAME_MINIBUF_ONLY_P (f)
+         && !EQ (val, f->minibuffer_window))
+       error ("Can't change the surrogate minibuffer of a frame with its own minibuffer");
 
       /* Install the chosen minibuffer window, with proper buffer.  */
       f->minibuffer_window = val;