The following issues have been filed to track the handling of these enum values: * Handle the UITouchTypeIndirectPointer enum value. https://github.com/flutter/flutter/issues/53696 * Handle the UITouchPhaseRegion enum values. https://github.com/flutter/flutter/issues/53695 No change in functionality. Only makes the iOS engine build on the latest versions of Xcode and iOS SDK. The enum values cannot be used with the API_AVAILABLE macro because the buildbots have not been updated yet.
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