Sampler preview disappears when switching tabs or applications

### Custom Node Testing

- [x] I have tried disabling custom nodes and the issue persists (see [how to disable custom nodes](https://docs.comfy.org/troubleshooting/custom-node-issues#step-1%3A-test-with-all-custom-nodes-disabled) if you need help)

### Expected Behavior

Start run, run reaches sampler (teacache, hunyuan etc) and preview begins in sampler. Switch to another tab or a different application that covers the sampler on screen. Return to tab or application and preview is still there.

### Actual Behavior

Regardless of sampler (teacache, hunyuan, etc), the sampler preview is lost if you switch tabs or switch to an application that covers the sampler.

Ubuntu Linux

### Steps to Reproduce

Start a run with sampler preview enabled. Switch tabs or change to an application that covers the sampler on screen. Return to ComfyUI from application or return to original tab in ComfyUI.

### Debug Logs

```powershell
There is no anomaly in the log.
```

### Other

_No response_