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.

2 files changed, 16 insertions, 3 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 2b105e2405e..59eb16a81e9 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,11 @@
+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.
diff --git a/src/w32term.c b/src/w32term.c
index 2fe3fe07462..0b22fd178e4 100644
--- a/src/w32term.c
+++ b/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 ();
 }