Some animations not updating while playing sound in Windows Media Player

[ErnWong]

Originally noted in issue #286

To reproduce: On the Windows 98 demo, play a wave sound file, and as it is playing, hover the cursor over the play button.
Expected: The tooltips should show up immediately and the sound playback should be uninterrupted.
Observed: The sound is interrupted, and only when you move the mouse does the tooltip animation start to update, and the next sound fragment is played.

Other kinds of animation also produce this effect, e.g. opening the start menu, opening menus, and minimising the window.

[wee210]

(Note: Excuse my username, this is a temporary account)
This is a problem I experience a lot. When I load "The Microsoft Sound.wav" and play it in Windows Media Player, usually hovering over something like the x button to close the window will stop the audio and prevent the animation from continuing. In order to let the animation complete and continue playing audio, you have to move the cursor.

This is most likely an error using Javascript to emulate/virtualize Windows, or the code used for Windows 98 on v86.