wxWidgets is native - it's simply a thin, cross-platform wrapper on the actual UI from the underlying system. No interface controls are reimplemented unless strictly necessary.
Simply using native widgets is not enough. A "native" app has to feel like a first class citizen in the ecosystem it is running. Achieving something like this with Proton is a tall order.
Native doesn't always mean that. It often just refers to a simple technical distinction of native vs web. Sometimes it also refers to a certain 'feel'. Depends on context.
> Achieving something like this with Proton is a tall order.
That's kinda obvious since Proton just uses wine under the hood. But everything else about what you're running will be native. With wxwidgets it will use true Windows widgets as reimplemented by wine.
Simply using native widgets is not enough. A "native" app has to feel like a first class citizen in the ecosystem it is running. Achieving something like this with Proton is a tall order.