Clover cannot instrument decision branches in case when variable assignment is used (this is due to fact that such expression is hard to rewrite without causing a compile error - see CLOV-408). That's why it shows red marker with "?" on page margin - as we don't know whether decision branch was evaluated to both true and false. On the other hand, the whole while loop was executed, so statement coverage is green - that's why we see green marker in the same line too.
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