White flash when opening window

**Problem**

When opening a window Dioxus desktop application, a white screen, seemingly without any content, flashes for a split second. This also happens while the app is already loaded and running, and an existing window is just un-minimized. It doesn't happen every time, but still very often (like 80%). The flash is very short, however, it's quite noticable when the actual app content has dark background. It also happens on release builds.

**Steps To Reproduce**

This doesn't seem to be limited to a specific Dioxus app. I tested it with the [calculator example](https://github.com/DioxusLabs/dioxus/blob/main/examples/calculator.rs). I just changed the CSS a bit to make background black so the issue is more noticable.

**Expected behavior**

There should be no white flash when opening a window.

**Screenshots**

https://github.com/user-attachments/assets/92075e6d-152e-49e9-beba-808e11bbd9e6

Note that the video is slightly slowed down to make the flash more noticable.

**Environment:**

- Dioxus version: 0.6.3
- Rust version: 1.88.0
- OS info: Windows 11
- App platform: desktop