Maybe because

|=

is also the bitwise or operator and that would be translated as

or

, and they forgot to check for the boolean case.

I looked at it again after all this time and realised that

|=

in Java is the “compound assignment” for “boolean logical operator” (

|

), not for the “conditional-or operator” (

||

). So there was no bug there in the IDE 😛

That's good to know, thanks!