fix(example): workaround to prevent winit crash when unfocused

[pewsheen]

It's a workaround for issue #1318

Root cause

In Wry, we replace the content view with WryWebViewParent to pass key events to the application menu. When the window is unfocused, winit will call WindowDelegate::window_did_resign_key and get the contentView. It assumes the contentView is WinitView and gets its ivar _state. The ivar does not exist in our WryWebViewParent, so the exception is thrown.

Workaround

WebViewBuilder::new_as_child will not create WryWebViewParent to replace the contentView, so it will be safe to use in winit.

[github-actions]

Package Changes Through a182fb6

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	0.41.0	0.42.0

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[wusyong]

No need for patch if it's example.