[layers] Limited to 32 layers. (previously there was no limit and the 16-bit depth buffer wrapped). Fixed a display bug after picture transforms or layers add/del.

git-svn-id: svn://pulkomandy.tk/GrafX2/branches/layers@1075 416bcca6-2ee7-4201-b75f-2eb2f807beb1

engine.c

@@ -1042,6 +1042,7 @@ void Main_handler(void)
                   Hide_cursor();
                   Display_all_screen();
                   Display_cursor();
+                  End_of_modification();
                 }
                 action++;
                 break;
@@ -1054,6 +1055,7 @@ void Main_handler(void)
                   Hide_cursor();
                   Display_all_screen();
                   Display_cursor();
+                  End_of_modification();
                 }
                 action++;
                 break;