BACKENDS: 3DS: GOB: Fingus's mouth behaves strangely during the walk animation when the game is played on the top screen

[Agetian]

This interesting issue only happens when ScummVM is set to display the game graphics on the top screen of a 3DS (it also happens when the game is shown on both screens simultaneously, in which case it's only noticeable on the top screen as well).

As Fingus is walking (tested e.g. on the very first level and on the Fountain level), for some reason he'll constantly alternate between his standard face and his "open mouth" face, which makes it look as if he's continuously opening and closing his mouth. It's also possible to stop the character with his mouth open, and then if you order him to move in a different direction, he'll turn with his mouth open. It looks funny and bizarre but it's unquestionably wrong behavior.

Interestingly, this does *not* manifest itself on the bottom screen of the 3DS. Even when the game is played on both screens, the bottom screen remains correct, while the top screen alternates between two different mouth positions.

Tested with the original floppy version of the game (English). Also tested with the GOG re-release. Not sure if this matters or if it works the same on any version of the game.

To reproduce:

1. Start Gobliins 2 on the 3DS. Proceed to the very first level (Village).
2. Set the game to display on either the top screen or on both screens at once.
3. Select Fingus and walk around the village. His weird mouth animation should be noticeable at this point on the top screen of the 3DS. If not, try the same on the Fountain level.

Not sure if this is level-specific or happens on all game levels.
Tested with the latest ScummVM 2.7.0 (as of this writing), as well as with the previous build (ScummVM 2.6.0). Tested on the .3dsx version ran through the Homebrew Launcher, in case it matters.

Amusingly, it doesn't seem to affect Winkle (or maybe his speech animation is not as drastically different from his normal mouth position, which is why it's not noticeable or barely noticeable).

I also checked if Goblins 3 has a similar effect, but appears that it doesn't and it plays normally on either screen.