set plugin priority, fixes #350

[mkalkbrenner]

see #755
see #756

[codecov-commenter]

Codecov Report

Merging #803 into master will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #803      +/-   ##
============================================
- Coverage     90.63%   90.59%   -0.05%     
  Complexity     3528     3528              
============================================
  Files           304      304              
  Lines          7624     7623       -1     
============================================
- Hits           6910     6906       -4     
- Misses          714      717       +3     

Flag	Coverage Δ	Complexity Δ
#unittests	90.59% <100.00%> (-0.05%)	3528.00 <6.00> (ø)

Impacted Files	Coverage Δ	Complexity Δ
src/Plugin/CustomizeRequest/CustomizeRequest.php	100.00% <100.00%> (ø)	31.00 <6.00> (ø)
src/Plugin/Loadbalancer/Loadbalancer.php	100.00% <100.00%> (ø)	52.00 <0.00> (ø)
src/Plugin/PostBigRequest.php	100.00% <100.00%> (ø)	8.00 <0.00> (ø)
src/Core/Event/PreExecuteRequest.php	80.00% <0.00%> (-20.00%)	7.00% <0.00%> (ø%)

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[wickedOne]

yes, this fixes the issue for whoever uses the PostBigRequest combined with the CustomizeRequest / LoadBalancer in conjunction with the symfony event dispatcher (which would be the vast majority). 👍

nevertheless a mention in the documentation about in which order of the plugins should be registered would be a good addition for those using another dispatcher i think.