event: implement source muxing on Windows #512
Merged
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Implement the cases in
_dispatch_unote_register_muxed()
and_dispatch_unote_unregister_muxed()
for when multiple event sources areopen on a handle and we need to combine them.
The test suite doesn't hit these codepaths anywhere and we haven't run
into issues with Foundation yet, so I added a dispatch_io_muxed test
which opens multiple sources on a file/pipe/socket and checks that
events fire correctly.