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After closing IZ #79912 project stops parsing after user closes project. But the file that was being parsed at the moment user closed project continues to parse. It would be fine to interrupt its parsing somehow.
This request made sense when parsing took long time (10-20 seconds) even for a single file. Now, when parsing of a single file takes at most second or two, the severity of the issue became much lower.
Since this has minimal user impact, this seems more like a design decision than a defect. The defect is closed.