Desktop Ruffle delay when tracking mouse coordinates

[KupoGames]

Describe the bug

There seems to be a significant delay in Ruffle when tracking the mouse coordinates, that doesn't happen in Flashplayer.
This seems to only happen in Desktop Ruffle, and not in the browser version.

Here's an example of my code:

`stage.addEventListener(Event.ENTER_FRAME, onFrame);
stage.addEventListener(MouseEvent.MOUSE_MOVE, onMouseMove);

//mouse1 and mouse2 are MovieClips imitating a cursor

function onFrame(e:*){
mouse1.x = mouseX;
mouse1.y = mouseY;
}

function onMouseMove(e:*){
mouse2.x = mouseX;
mouse2.y = mouseY;
}`

In Flashplayer my new cursor "mouse1" seems to track the system mouse perfectly, maybe 1 frame behind.
In Desktop Ruffle, it feels like 5 or 6 frames behind the system mouse, and ENTER_FRAME and MOUSE_MOVE give slightly different results.
This seems to effect dragging behaviour also.

Here's a .gif of the issue:

@kjarosh

Expected behavior

The browser version of Ruffle seems to work correctly, the delay only happens on Desktop.

Content Location

Code in the description.

Affected platform

Desktop app

Operating system

Windows 10

Browser

No response

Additional information

No response

[kjarosh]

Can you attach the SWF?

[KupoGames]

Can you attach the SWF?

I don't know how to attach it on GitHub, so here's a Dropbox link:
https://www.dropbox.com/scl/fi/r6plsx7xqp18647deihtm/cursor-test.swf?rlkey=5zgtiojgtuqbkk39saaw0cjer&dl=0

[kjarosh]

I moved the issue with desynchronized cursors to #19222, let's track the delay only here.