2.x: fix Flowable.concatMapEager hang due to bad request management #4751
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Flowable.concatMapEager
's drain loop when encountering a finished inner jumped back to the beginning of the loop but disregarded the potentially changed request amount and just stopped emitting. The fix is to use the typical request management approach of reading the current request at the beginning of the loop and then committing the emission amount before trying to leave the loop.Related: #4620
In addition
TestHelper.assertError
has been changed to attach the whole unexpected exception to theAssertionError
.