extracted_samples_table should only show visible samples #2052 #6435

Job	Run time
Tests (mysql, rails test test/unit)	25m 24s
Tests (mysql, rails test test/functional)	36m 21s
Tests (mysql, rails test test/integration)	18m 27s
Tests (mysql, rspec spec)	3m 6s
Tests (mysql, rake assets:precompile)	3m 23s
Tests (mysql, rake db:setup)	3m 10s
Tests (mysql, rake db:migrate)	3m 48s
Tests (mysql, rake seek:upgrade)	3m 32s
Tests (sqlite3, rails test test/unit)	20m 57s
	1h 58m 8s

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