Description

If the same exporter is defined in several levels (assembly and class) with different parameters, they are not merged.

Steps to Reproduce

1. Download attachment
2. Decompress
3. Run
4. At the end of benchmark you can see in Console output like this:

   // * Export *
   BenchmarkDotNet.Artifacts\results\TestMultipleExportIssue.SimpleBenchmark-report.csv
   BenchmarkDotNet.Artifacts\results\TestMultipleExportIssue.SimpleBenchmark-report-github.md
   BenchmarkDotNet.Artifacts\results\TestMultipleExportIssue.SimpleBenchmark-report.html
   CustomExporter - Benchmark
   CustomExporter - Assembly

Expected Behavior

Console output like this:

// * Export *
BenchmarkDotNet.Artifacts\results\TestMultipleExportIssue.SimpleBenchmark-report.csv
BenchmarkDotNet.Artifacts\results\TestMultipleExportIssue.SimpleBenchmark-report-github.md
BenchmarkDotNet.Artifacts\results\TestMultipleExportIssue.SimpleBenchmark-report.html
CustomExporter - Benchmark

Version: 0.12.1

Attachment

TestMultipleExportIssue.zip