bug#25851: 25.2; GTK warning when starting Emacs when desktop file has more than one frame

[martin rudalics <rudalics@gmx.at>]

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 >> But doesn't your Emacs 25 already contain the patch?
 >
 > No. Not if I understand correctly.
 >
 > _My_ Emacs 25.2.rc2 is modified so that the entire body of
 > xg_set_geometry() is deleted and replaced by a call to
 > gtk_window_move(). This fixes the bug and did not produce any
 > adverse effects in six weeks of use (on my system at least).
 >
 > My Emacs 25.2 is the stock release from the tarball. I don't know
 > if it contains any patch for this bug, but if it does that patch
 > does not appear to work.
 >
 >> The only difference I made lately was to set the default value
 >> of ‘x-gtk-use-window-move’ so all you have to do is to make the
 >> last line of your xterm.c read
 >>
 >> x_gtk_use_window_move = true;
 >
 > The symbol `x_gtk_use_window_move' is not defined in the emacs-25
 > branch, only in master.

Sorry.  I forgot to tell you to apply that change to your Emacs 25 back
then.  Please remove any changes I proposed earlier and try to apply the
attached x_gtk_use_window_move.diff to your Emacs 25.

Thanks, martin

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--- a/src/gtkutil.c
+++ b/src/gtkutil.c
@@ -783,33 +783,55 @@ xg_set_geometry (struct frame *f)
 {
   if (f->size_hint_flags & (USPosition | PPosition))
     {
-      int left = f->left_pos;
-      int xneg = f->size_hint_flags & XNegative;
-      int top = f->top_pos;
-      int yneg = f->size_hint_flags & YNegative;
-      char geom_str[sizeof "=x--" + 4 * INT_STRLEN_BOUND (int)];
-      guint id;
-
-      if (xneg)
-        left = -left;
-      if (yneg)
-        top = -top;
-
-      sprintf (geom_str, "=%dx%d%c%d%c%d",
-               FRAME_PIXEL_WIDTH (f),
-               FRAME_PIXEL_HEIGHT (f),
-               (xneg ? '-' : '+'), left,
-               (yneg ? '-' : '+'), top);
-
-      /* Silence warning about visible children.  */
-      id = g_log_set_handler ("Gtk", G_LOG_LEVEL_WARNING | G_LOG_FLAG_FATAL
-                              | G_LOG_FLAG_RECURSION, my_log_handler, NULL);
-
-      if (!gtk_window_parse_geometry (GTK_WINDOW (FRAME_GTK_OUTER_WIDGET (f)),
-                                      geom_str))
-        fprintf (stderr, "Failed to parse: '%s'\n", geom_str);
-
-      g_log_remove_handler ("Gtk", id);
+      if (x_gtk_use_window_move)
+	{
+	  /* Handle negative positions without consulting
+	     gtk_window_parse_geometry (Bug#25851).  The position will
+	     be off by scrollbar width + window manager decorations.  */
+	  if (f->size_hint_flags & XNegative)
+	    f->left_pos = (x_display_pixel_width (FRAME_DISPLAY_INFO (f))
+			   - FRAME_PIXEL_WIDTH (f) + f->left_pos);
+
+	  if (f->size_hint_flags & YNegative)
+	    f->top_pos = (x_display_pixel_height (FRAME_DISPLAY_INFO (f))
+			  - FRAME_PIXEL_HEIGHT (f) + f->top_pos);
+
+	  gtk_window_move (GTK_WINDOW (FRAME_GTK_OUTER_WIDGET (f)),
+			   f->left_pos, f->top_pos);
+
+	  /* Reset size hint flags.  */
+	  f->size_hint_flags &= ~ (XNegative | YNegative);
+	}
+      else
+	{
+	  int left = f->left_pos;
+	  int xneg = f->size_hint_flags & XNegative;
+	  int top = f->top_pos;
+	  int yneg = f->size_hint_flags & YNegative;
+	  char geom_str[sizeof "=x--" + 4 * INT_STRLEN_BOUND (int)];
+	  guint id;
+
+	  if (xneg)
+	    left = -left;
+	  if (yneg)
+	    top = -top;
+
+	  sprintf (geom_str, "=%dx%d%c%d%c%d",
+		   FRAME_PIXEL_WIDTH (f),
+		   FRAME_PIXEL_HEIGHT (f),
+		   (xneg ? '-' : '+'), left,
+		   (yneg ? '-' : '+'), top);
+
+	  /* Silence warning about visible children.  */
+	  id = g_log_set_handler ("Gtk", G_LOG_LEVEL_WARNING | G_LOG_FLAG_FATAL
+				  | G_LOG_FLAG_RECURSION, my_log_handler, NULL);
+
+	  if (!gtk_window_parse_geometry (GTK_WINDOW (FRAME_GTK_OUTER_WIDGET (f)),
+					  geom_str))
+	    fprintf (stderr, "Failed to parse: '%s'\n", geom_str);
+
+	  g_log_remove_handler ("Gtk", id);
+	}
     }
 }

@@ -1406,6 +1428,13 @@ x_wm_set_size_hint (struct frame *f, long int flags, bool user_position)
   else if (win_gravity == StaticGravity)
     size_hints.win_gravity = GDK_GRAVITY_STATIC;

+  if (x_gtk_use_window_move)
+    {
+      if (flags & PPosition) hint_flags |= GDK_HINT_POS;
+      if (flags & USPosition) hint_flags |= GDK_HINT_USER_POS;
+      if (flags & USSize) hint_flags |= GDK_HINT_USER_SIZE;
+    }
+
   if (user_position)
     {
       hint_flags &= ~GDK_HINT_POS;
diff --git a/src/xterm.c b/src/xterm.c
index 7856793..4f9eff6 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -10056,11 +10056,26 @@ x_set_offset (struct frame *f, register int xoff, register int yoff, int change_
 	f->size_hint_flags |= YNegative;
       f->win_gravity = NorthWestGravity;
     }
+
   x_calc_absolute_position (f);

   block_input ();
   x_wm_set_size_hint (f, 0, false);

+#ifdef USE_GTK
+  if (x_gtk_use_window_move)
+    {
+      /* When a position change was requested and the outer GTK widget
+	 has been realized already, leave it to gtk_window_move to DTRT
+	 and return.  Used for Bug#25851 and Bug#25943.  */
+      if (change_gravity != 0 && FRAME_GTK_OUTER_WIDGET (f))
+	gtk_window_move (GTK_WINDOW (FRAME_GTK_OUTER_WIDGET (f)),
+			 f->left_pos, f->top_pos);
+      unblock_input ();
+      return;
+    }
+#endif /* USE_GTK */
+
   modified_left = f->left_pos;
   modified_top = f->top_pos;

@@ -12905,4 +12920,11 @@ state.
 Set this variable only if your window manager cannot handle the
 transition between the various maximization states.  */);
   x_frame_normalize_before_maximize = false;
+
+  DEFVAR_BOOL ("x-gtk-use-window-move", x_gtk_use_window_move,
+    doc: /* Non-nil means rely on gtk_window_move to set frame positions.
+If this variable is t, the GTK build uses the function gtk_window_move
+to set or store frame positions and disables some time consuming frame
+position adjustments.  */);
+  x_gtk_use_window_move = true;
 }