Remove AsRef<Window> on WebviewWindow

[Legend-Master]

This reverts the AsRef<Window> impl for WebviewWindow made in #14012

cc @WSH032, after some discussion with the team, we think we should avoid this type of breaking changes in minors

And we can instead, add explicit methods like as_window, as_webview

[github-actions]

Package Changes Through b625a55

There are 10 changes which include tauri with minor, tauri-cli with minor, @tauri-apps/cli with minor, tauri-utils with minor, tauri-bundler with minor, tauri-macos-sign with minor, tauri-runtime-wry with minor, tauri-runtime with minor, @tauri-apps/api with minor, tauri-plugin with minor

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
@tauri-apps/api	2.7.0	2.8.0
tauri-utils	2.6.0	2.7.0
tauri-macos-sign	2.1.0	2.2.0
tauri-bundler	2.5.2	2.6.0
tauri-runtime	2.7.1	2.8.0
tauri-runtime-wry	2.7.2	2.8.0
tauri-codegen	2.3.1	2.3.2
tauri-macros	2.3.2	2.3.3
tauri-plugin	2.3.1	2.4.0
tauri-build	2.3.1	2.3.2
tauri	2.7.0	2.8.0
@tauri-apps/cli	2.7.1	2.8.0
tauri-cli	2.7.1	2.8.0

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[WSH032]

It's fine.

I just looked up some resources and found that whether this is considered a breaking change is somewhat controversial: https://std-dev-guide.rust-lang.org/breaking-changes/new-trait-impls.html#inference-breaks-when-a-second-generic-impl-is-introduced.

Personally, I wouldn't consider it a breaking change; otherwise, AsRef would be no different from Deref (both could only have one implementation).

But since it does break plugins before 2.8, reverting it is reasonable. This isn't very elegant—it's really unfortunate for Rust 😂

[Legend-Master]

Yeah, that's the problem, it is not a problem by itself but the way we have a single AsRef impl to begin with makes it a breaking change and the fact that it does affect the plugins usages right now