make-pointer-invisible on Windows

[martin rudalics <rudalics@gmx.at>]

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I intend to apply the attached patch in order to fix this problem for
the Windows build (see Bug#6105 and Bug#12922).  Comments welcome.

Thanks, martin

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--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -3974,11 +3974,17 @@ w32_wnd_proc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
       if (LOWORD (lParam) == HTCLIENT)
 	{
 	  f = x_window_to_frame (dpyinfo, hwnd);
-	  if (f && f->output_data.w32->hourglass_p
-	      && !menubar_in_use && !current_popup_menu)
-	    SetCursor (f->output_data.w32->hourglass_cursor);
-	  else if (f)
-	    SetCursor (f->output_data.w32->current_cursor);
+	  if (f)
+	    {
+	      if (f->output_data.w32->hourglass_p
+		  && !menubar_in_use && !current_popup_menu)
+		SetCursor (f->output_data.w32->hourglass_cursor);
+	      else if (f->pointer_invisible)
+		SetCursor (NULL);
+	      else
+		SetCursor (f->output_data.w32->current_cursor);
+	    }
+
 	  return 0;
 	}
       goto dflt;
@@ -3991,7 +3997,12 @@ w32_wnd_proc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 	  {
 	    f->output_data.w32->current_cursor = cursor;
 	    if (!f->output_data.w32->hourglass_p)
-	      SetCursor (cursor);
+	      {
+		if (f->pointer_invisible)
+		  SetCursor (NULL);
+		else
+		  SetCursor (cursor);
+	      }
 	  }
 	return 0;
       }
diff --git a/src/w32term.c b/src/w32term.c
index b7c6e13..7c5f2db 100644
--- a/src/w32term.c
+++ b/src/w32term.c
@@ -6590,7 +6590,10 @@ w32_hide_hourglass (struct frame *f)
   struct w32_output *w32 = FRAME_X_OUTPUT (f);
 
   w32->hourglass_p = 0;
-  SetCursor (w32->current_cursor);
+  if (f->pointer_invisible)
+    SetCursor (NULL);
+  else
+    SetCursor (w32->current_cursor);
 }
 
 /* FIXME: old code did that, but I don't know why.  Anyway,
@@ -6602,6 +6605,25 @@ w32_arrow_cursor (void)
   SetCursor (w32_load_cursor (IDC_ARROW));
 }
 
+static void
+w32_toggle_invisible_pointer (struct frame *f, bool invisible)
+{
+  block_input ();
+
+  if (f->pointer_invisible != invisible)
+    {
+      f->pointer_invisible = invisible;
+      SET_FRAME_GARBAGED (f);
+    }
+
+  if (invisible)
+    SetCursor (NULL);
+  else
+    SetCursor (f->output_data.w32->current_cursor);
+
+  unblock_input ();
+}
+
 /***********************************************************************
 			    Initialization
  ***********************************************************************/
@@ -6741,6 +6763,7 @@ w32_create_terminal (struct w32_display_info *dpyinfo)
   terminal->ins_del_lines_hook = x_ins_del_lines;
   terminal->delete_glyphs_hook = x_delete_glyphs;
   terminal->ring_bell_hook = w32_ring_bell;
+  terminal->toggle_invisible_pointer_hook = w32_toggle_invisible_pointer;
   terminal->update_begin_hook = x_update_begin;
   terminal->update_end_hook = x_update_end;
   terminal->read_socket_hook = w32_read_socket;