Sync upstream winui3/main - 2026-01-07#13

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riverar wants to merge 13 commits intomainfrom

sync-upstream-20260107-122702

Commits on Dec 27, 2025

Syncing content from committish 8355d5e6d13b992f5d6f54183a5f8aa73e214488
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Commits on Dec 29, 2025

Syncing content from committish 1e9018ac05740620c1287c25f283fb875807c9a7
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Commits on Dec 30, 2025

Syncing content from committish a6625368bd42ef1785800dab0c0106bf02098fea
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Syncing content from committish 61ed270500566d622741a76839c7b2f02644a655
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Commits on Jan 4, 2026

Syncing content from committish 42ac060add60abdd41be8acae220f50400292bb7
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Commits on Jan 5, 2026

Syncing content from committish 9105d4a85fee1a83abe81c589c3ecbc4856ec9d3
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Merged PR 14476899: Enable warning level 4
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Commits on Jan 6, 2026

Merged PR 14493027: XamlPredicate: Allow writing custom predicates without the need of explicit Bindable attribute
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Syncing content from committish 6759699b694700461f46dd1bfebe52b2c63af4d4
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Syncing content from committish baaad7a79453105c924e99eba300f3d21ed11b5d
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Syncing content from committish 906855541e7a7d6185a00be925fdae6ea112aaeb
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Commits on Jan 7, 2026