From: Eli Zaretskii <eliz@gnu.org>
Date: Tue, 29 Mar 2016 17:38:54 +0000 (+0300)
Subject: Fix rare problems with echo-area display and multiple frames
X-Git-Tag: emacs-25.0.93~89^2~2
X-Git-Url: https://code.delx.au/gnu-emacs/commitdiff_plain/06495c96ae0f5a0fa1d56f47750624138f80cb94

Fix rare problems with echo-area display and multiple frames

* src/xdisp.c (redisplay_window): Bind inhibit-redisplay non-nil
around the call to x_consider_frame_title, to prevent
resize_mini_window from undoing echo-area display.  (Bug#23124)
---

diff --git a/src/xdisp.c b/src/xdisp.c
index d701306b22..5be94f0cd0 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -17082,7 +17082,16 @@ redisplay_window (Lisp_Object window, bool just_this_one_p)
 	    ignore_mouse_drag_p = true;
 #endif
         }
+      ptrdiff_t count1 = SPECPDL_INDEX ();
+      /* x_consider_frame_title calls select-frame, which calls
+	 resize_mini_window, which could resize the mini-window and by
+	 that undo the effect of this redisplay cycle wrt minibuffer
+	 and echo-area display.  Binding inhibit-redisplay to t makes
+	 the call to resize_mini_window a no-op, thus avoiding the
+	 adverse side effects.  */
+      specbind (Qinhibit_redisplay, Qt);
       x_consider_frame_title (w->frame);
+      unbind_to (count1, Qnil);
 #endif
     }