see #1556 Macro-fuse consecutive map calls / consecutive filter calls

[simonbasle]

[codecov-io]

Codecov Report

Merging #1833 into master will decrease coverage by 0.08%. The diff coverage is 93.03%.

@@             Coverage Diff              @@
##             master    #1833      +/-   ##
============================================
- Coverage     81.51%   81.43%   -0.09%     
- Complexity     3890     3990     +100     
============================================
  Files           372      372              
  Lines         30187    30333     +146     
  Branches       5648     5694      +46     
============================================
+ Hits          24608    24702      +94     
- Misses         4029     4076      +47     
- Partials       1550     1555       +5

Impacted Files	Coverage Δ	Complexity Δ
...src/main/java/reactor/core/publisher/MonoWhen.java	67.22% <ø> (ø)	6 <0> (ø)	:arrow_down:
.../java/reactor/core/publisher/FluxMergeOrdered.java	97.82% <ø> (ø)	10 <0> (ø)	:arrow_down:
...rc/main/java/reactor/core/publisher/MonoFirst.java	54.83% <ø> (ø)	7 <0> (ø)	:arrow_down:
...in/java/reactor/core/publisher/MonoDelayUntil.java	78.26% <ø> (ø)	5 <0> (ø)	:arrow_down:
.../src/main/java/reactor/core/publisher/MonoZip.java	85.06% <ø> (ø)	10 <0> (ø)	:arrow_down:
...n/java/reactor/core/publisher/FluxConcatArray.java	82.6% <ø> (ø)	10 <0> (ø)	:arrow_down:
...rc/main/java/reactor/core/publisher/FluxMerge.java	72.41% <ø> (ø)	5 <0> (ø)	:arrow_down:
...java/reactor/core/publisher/FluxFirstEmitting.java	72.26% <ø> (ø)	8 <0> (ø)	:arrow_down:
.../src/main/java/reactor/core/publisher/FluxZip.java	96.07% <ø> (ø)	30 <0> (ø)	:arrow_down:
...in/java/reactor/core/publisher/MonoIgnoreThen.java	77.59% <ø> (ø)	4 <0> (ø)	:arrow_down:
... and 26 more

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[chemicL]

Closing as this is quite dated and if we decide upon implementing macro fusion of consecutive operator calls we can revisit the ideas explored here.