NEVERHOOD: TV guy subtitle jitter in module 2400

[Player701]

Synopsis: When using the ​fan-made Russian translation patch, the subtitles for the TV guy in module 2400 (aka "Aqua House") constantly jitter left and right while he is speaking. This is even mentioned in the official readme for the patch (ENG-READ.txt in the archive).

I've done an investigation, and it seems that the problem originates in the ​AnimatedSprite::updatePosition() method. Since the sprite offsets keep changing with each frame, the position of the subtitle surface changes as well, which produces the jitter.

An easy workaround would be to wrap the call to _subtitleSurface->updatePosition in if(_currFrameIndex == 1), but this is technically not a proper fix because it does not account for sprites that are actually moving. The latter, however, is purely a theoretical scenario, seeing as there are no more dialogue lines in the interactive part of the game (except for the disk player videos, but those are handled by a different piece of code and are therefore irrelevant anyway). So unless someone wants to add stuff like closed captioning in the future, the proposed solution should suffice for now.

I'm also attaching a save file for easier testing (the musical puzzle has been solved, just press the button to enter the building and wait for the subtitles to appear).