Instructions not showing up in game

[Computerdude77]

In the game Xtreme Super Modified Spoon Jumping, there is an issue with the instructions. When the game asks the player to start over, it also has an option to view the instructions. However, the button does nothing when clicked, instead of showing the instructions, which is showcased in the screenshots below. This was tested on the archive.org Ruffle and the web demo on Windows 10 Chrome 87, the web demo is on version 2021-01-13 at the time of writing this.

Original:

Ruffle:

[n0samu]

This is quite a strange issue. The Instructions button has the following code attached:

on(press){
   instructMC.transform("easeOutCubic",15,"_y",130);
}

This does not actually call MovieClip.transform because the game overrides this method with its own implementation:

MovieClip.prototype.transform = function(myTween, myDuration, myProperty, myValue)
{
   var _loc4_ = ++this.nextHighestDepth;
   var myController = this.createEmptyMovieClip("controller" + _loc4_,_loc4_);
   ...

Adding trace statements to the code above, we can see what happens after clicking the Instructions button in the debug Flash Player:

Calling instructMC.transform
Running MovieClip.prototype.transform

Yet in Ruffle, the game's MovieClip.prototype.transform code never runs:

Calling instructMC.transform

Here is the SWF with trace statements added: [trace]xtremeSpoonJumping.zip

[Toad06]

transform is a property that was added in SWFv8. This game is a SWFv6 file. The following code gives different results in Flash Player depending on the SWF version.

MovieClip.prototype.transform = function() {
   return "overriden transform";
};
_root.attachMovie("mc", "mc", _root.getNextHighestDepth());
trace(mc.transform());

In SWFv8+: undefined

In previous SWF versions: overriden transform

---

Property version checking was implemented in #6856, so maybe it would just require a few adjustments to fix this issue? It would be great to have @Herschel's thoughts on that. ;)

[n0samu]

This also applies to other version-gated properties like scrollRect. Another way to reproduce this (with compiler targeting SWFv7):

MovieClip.prototype.scrollRect = "hello";
_root.createEmptyMovieClip("mc", _root.getNextHighestDepth());
trace(mc.scrollRect);