[layers] continuted work on no-layer option. No more crash.

git-svn-id: svn://pulkomandy.tk/GrafX2/branches/layers@1141 416bcca6-2ee7-4201-b75f-2eb2f807beb1

buttons.c

@@ -1286,9 +1286,12 @@ void Button_Page(void)
   SWAP_BYTES (Main_format,Spare_format)
   SWAP_WORDS (Main_fileselector_position,Spare_fileselector_position)
   SWAP_WORDS (Main_fileselector_offset,Spare_fileselector_offset)
+
   SWAP_SHORTS(Main_current_layer,Spare_current_layer)
   SWAP_DWORDS (Main_layers_visible,Spare_layers_visible)
 
+  Update_screen_targets();
+
   // A la fin, on affiche l'écran
   for (factor_index=0; ZOOM_FACTOR[factor_index]!=Main_magnifier_factor; factor_index++);
   Change_magnifier_factor(factor_index);

pages.c

@@ -959,6 +959,8 @@ void End_of_modification(void)
   memcpy(Visible_image[1].Image,
          Visible_image[0].Image,
          Main_image_width*Main_image_height);
+#else
+  Update_screen_targets();
 #endif
   
   Download_infos_backup(Main_backups);