feat(linux): allow disabling WebViewUriLoader via feature

[dgerhardt]

A new feature flag linux-request-queue has been introduced, which is enabled by default to keep the previous behavior.

The WebViewUriLoader is a workaround for an unknown bug but disabling it can be useful because

• it introduces a deadlock situation, and
• the bug might no longer exist in newer WebKitGTK versions.

Refs tauri-apps/tauri#12589
Refs #359

[github-actions]

Package Changes Through a262a4b

There are 1 changes which include wry 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
wry	0.51.2	0.52.0

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[dgerhardt]

@chippers @wusyong Could you have a look at this PR? It is related to a workaround introduced with #359, which you submitted/reviewed.

[lucasfernog]

shouldn't this be done via a configuration in the webview attributes instead of a feature flag?

[lucasfernog]

it's also a pretty feature creepy config anyway

[dgerhardt]

@lucasfernog I've used a feature under the assumption that the marked code is a preparation for a complete removal in the future when the underlying Webkit2GTK issue has been fixed.

If you think that a webview attribute would be more appropriate in this case, I'm happy to adjust the PR.

[dgerhardt]

I had a look at implementing this using PlatformSpecificWebViewAttributes. I might be missing something, but I don't see a way to override the attribute defaults for webviews on the application side. It wouldn't make much sense to pass the setting to every single webview on creation since you would either globally enable or disable the workaround.