[feat] Change Window theme dynamically at runtime

[tauri-bot]

This issue has been upstreamed from tauri-apps/tauri#5279

Describe the problem

As far as I can tell from the docs, concerning the theme of the window, there are JS APIs for only (1) getting the window's current theme, and (2) listening to the system theme change.

I'm trying to set the window's theme to "dark"/"light" as well when the user chooses the "dark"/"light" theme in my app.

Is there a way to dynamically change the theme of the window through JavaScript?

Describe the solution you'd like

A JS API to change the theme of the window.

Alternatives considered

No response

Additional context

No response

[martpie]

A rust-only way of changing the window theme at runtime would already be amazing :]