Increase visible lines of code in IfController and WhileController

[dgetzlaf]

Increase the visible lines of code in IfController and WhileController from 5 to 15 to write more complex statements.

[codecov-commenter]

Codecov Report

Merging #665 (2052f5e) into master (25ab888) will decrease coverage by 0.11%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #665      +/-   ##
============================================
- Coverage     55.46%   55.35%   -0.12%     
- Complexity    10181    10193      +12     
============================================
  Files          1046     1046              
  Lines         64147    64437     +290     
  Branches       7265     7309      +44     
============================================
+ Hits          35580    35668      +88     
- Misses        26060    26263     +203     
+ Partials       2507     2506       -1     

Impacted Files	Coverage Δ	Complexity Δ
...g/apache/jmeter/control/gui/IfControllerPanel.java	68.00% <100.00%> (ø)	8.00 <0.00> (ø)
.../apache/jmeter/control/gui/WhileControllerGui.java	78.12% <100.00%> (ø)	7.00 <0.00> (ø)
...protocol/bolt/sampler/AbstractBoltTestElement.java	61.29% <0.00%> (-18.71%)	12.00% <0.00%> (+6.00%)	⬇️
...he/jmeter/protocol/http/gui/HTTPFileArgsPanel.java	33.64% <0.00%> (-14.54%)	9.00% <0.00%> (ø%)
...ter/protocol/http/proxy/SamplerCreatorFactory.java	27.90% <0.00%> (-13.96%)	4.00% <0.00%> (-1.00%)
...rg/apache/jmeter/util/keystore/JmeterKeyStore.java	24.35% <0.00%> (-2.70%)	7.00% <0.00%> (ø%)
.../org/apache/jmeter/config/gui/RowDetailDialog.java	9.84% <0.00%> (-2.42%)	1.00% <0.00%> (ø%)
...er/protocol/bolt/config/BoltConnectionElement.java	12.19% <0.00%> (-2.10%)	4.00% <0.00%> (ø%)
...ter/extractor/json/jmespath/JMESPathExtractor.java	79.46% <0.00%> (-1.85%)	34.00% <0.00%> (+1.00%)	⬇️
...a/org/apache/jmeter/config/gui/ArgumentsPanel.java	45.62% <0.00%> (-0.83%)	30.00% <0.00%> (ø%)
... and 12 more

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[FSchumacher]

Thanks for the patch.
I have chosen a different path, but I hope, that you still like the result.

[dgetzlaf]

@FSchumacher thank you very much for implementing a nice fix ! :)