execute_background internal assert - vst3 view.rs on_fd_is_set read assert does not check EAGAIN and EWOULDBLOCK

[WeirdConstructor]

I am using the task executor and execute_background queue. I am getting the following error and my Bitwig VST3 plugin crashes:

[ERROR] thread 'unnamed' panicked at 'assertion `left == right` failed
  left: -1
 right: 1': /home/weicon/devel/rust/nih-plug/src/wrapper/vst3/view.rs:492
   0: <unknown>
   1: <unknown>
   2: <unknown>
   3: <unknown>
   4: <unknown>
   5: <unknown>
   6: <unknown>
   7: <unknown>
   8: <unknown>
   9: <unknown>
  10: <unknown>
  11: <unknown>
  12: <unknown>
  13: __libc_start_call_main
             at ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
  14: __libc_start_main_impl
             at ./csu/../csu/libc-start.c:392:3
  15: _start

The problem is, that libc::read can of course always return -1, even if the FD was woken up by the event loop. It's important to check if the errno == EAGAIN || errno == EWOULDBLOCK, because in those cases the error is okay and just means to try to read again.