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The enum Android.Content.PM.ConfigChanges is clearly intended to be used as a composable set of flags (hence the fact they increase by a power of two). However, this enum is not marked with the [Flags] attribute, thus eliciting the error message:
Bitwise operation on enum which is not marked by [Flags] attribute
I suspect this message is coming from ReSharper, but in any case, the enum should have that attribute added.
Assigning to Atsushi.
Atsushi, this is one of the few enums that do not have the "Flags" on their name, but is a Flags.
It is fixed in master and will be available in the next alpha release.
I have checked this issue on following builds:
Xamarin Studio : 4.2.3 (build 60)
Xamarin.Android: 4.13.0 (Business Edition)
Now this issue is working fine, Hence I am closing this issue.