fix(core): fix child webviews on macOS and Windows treated as full webview window #11870

Job	Run time
test (x86_64-pc-windows-msvc, windows-latest, 1.77.2, false, test, --no-default-features, no-defa...	5m 6s
test (x86_64-pc-windows-msvc, windows-latest, 1.77.2, false, test, --all-features, all)	6m 3s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.77.2, false, test, --no-default-features, no-def...	4m 32s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.77.2, false, test, --all-features, all)	6m 43s
test (aarch64-apple-darwin, macos-14, 1.77.2, false, test, --no-default-features, no-default)	2m 29s
test (aarch64-apple-darwin, macos-14, 1.77.2, false, test, --all-features, all)	3m 17s
test (aarch64-apple-ios, macos-latest, 1.77.2, false, build, --no-default-features, no-default)	2m 13s
test (aarch64-apple-ios, macos-latest, 1.77.2, false, build, --all-features, all)	2m 19s
test (aarch64-linux-android, ubuntu-latest, 1.77.2, true, build, --no-default-features, no-default)	1m 56s
test (aarch64-linux-android, ubuntu-latest, 1.77.2, true, build, --all-features, all)	1m 28s
	36m 6s

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