Fix bug #14841 with invisible frames on MS-Windows.

 src/w32term.c (w32_read_socket) <WM_EMACS_PAINT>: Warn about frame
 being re-exposed only if it didn't ask to become visible.
 <WM_SIZE>: Under SIZE_RESTORED, only set the frame visible if it
 was previously iconified.
 (x_iconify_frame): Mark the frame iconified.

src/ChangeLog

+2013-07-26  Eli Zaretskii  <eliz@gnu.org>
+
+	* w32term.c (w32_read_socket) <WM_EMACS_PAINT>: Warn about frame
+	being re-exposed only if it didn't ask to become visible.
+	<WM_SIZE>: Under SIZE_RESTORED, only set the frame visible if it
+	was previously iconified.  (Bug#14841)
+	(x_iconify_frame): Mark the frame iconified.
+
 2013-07-26  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Fix minor problems found by static checking.

src/w32term.c

@@ -4360,8 +4360,9 @@ w32_read_socket (struct terminal *terminal,
 		  SET_FRAME_VISIBLE (f, 1);
 		  SET_FRAME_ICONIFIED (f, 0);
 		  SET_FRAME_GARBAGED (f);
-		  DebPrint (("frame %p (%s) reexposed by WM_PAINT\n", f,
-			     SDATA (f->name)));
+		  if (!f->output_data.w32->asked_for_visible)
+		    DebPrint (("frame %p (%s) reexposed by WM_PAINT\n", f,
+			       SDATA (f->name)));
 
 		  /* WM_PAINT serves as MapNotify as well, so report
 		     visibility changes properly.  */
@@ -4819,7 +4820,8 @@ w32_read_socket (struct terminal *terminal,
 		  {
 		    bool iconified = FRAME_ICONIFIED_P (f);
 
-		    SET_FRAME_VISIBLE (f, 1);
+		    if (iconified)
+		      SET_FRAME_VISIBLE (f, 1);
 		    SET_FRAME_ICONIFIED (f, 0);
 
 		    /* wait_reading_process_output will notice this
@@ -6129,6 +6131,9 @@ x_iconify_frame (struct frame *f)
   /* Simulate the user minimizing the frame.  */
   SendMessage (FRAME_W32_WINDOW (f), WM_SYSCOMMAND, SC_MINIMIZE, 0);
 
+  SET_FRAME_VISIBLE (f, 0);
+  SET_FRAME_ICONIFIED (f, 1);
+
   unblock_input ();
 }