If enabled, the GIF disposal method is not handled, i.e. frames are not merged as required (frames may only contain image data that changed from the previous frame).
This is because animated GIF files are usually optimized, so each frame only includes the data that has changed from the previous frame.
This property is not applicable to multi-page loading (like TImageEnMIO and TImageEnMView).
If TImageEnIO is attached to TImageEnView, the layer positions (PosX and PosY) are also set.