fix #316 Correctly calculate the requested and produced items

[violetagg]

Take in account the delayed writes when calculating the requested
and produced items when onComplete/onError event is sent.

[codecov-io]

Codecov Report

Merging #327 into master will decrease coverage by 0.24%.
The diff coverage is 75%.

@@             Coverage Diff              @@
##             master     #327      +/-   ##
============================================
- Coverage     68.37%   68.12%   -0.25%     
+ Complexity     1025     1020       -5     
============================================
  Files            73       73              
  Lines          4310     4314       +4     
  Branches        615      614       -1     
============================================
- Hits           2947     2939       -8     
- Misses          994     1005      +11     
- Partials        369      370       +1

Impacted Files	Coverage Δ	Complexity Δ
...or/ipc/netty/channel/ChannelOperationsHandler.java	63.97% <75%> (-0.14%)	59 <1> (-1)
...tor/ipc/netty/channel/CloseableContextHandler.java	52.63% <0%> (-5.27%)	8% <0%> (-1%)
...or/ipc/netty/http/client/HttpClientOperations.java	56.31% <0%> (-1.58%)	78% <0%> (-2%)
...a/reactor/ipc/netty/channel/ChannelOperations.java	82.48% <0%> (-1.46%)	47% <0%> (-1%)
...or/ipc/netty/http/server/HttpServerOperations.java	70.52% <0%> (-0.53%)	55% <0%> (-1%)
...va/reactor/ipc/netty/channel/AbortedException.java	54.54% <0%> (+9.09%)	6% <0%> (+1%)	⬆️

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