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Mount a VCS filesystem (e.g. openide/src) and run Search (e.g. searching for "er") in the filesystem. Search results are correctly populated with nodes of the found files. After searching for another string in the filesystem (e.g. "oo") the Search Results window's tree of nodes gets corrupted. When I clicked on some other nodes in Explorer the IDE frozen. I will attach the thread dump. This issue is most probably related to the fix of memory leak (issue 40504). The problem appears only with VCS filesystem, not with local FS.
Created attachment 13835 [details] Thread dump of the IDE when frozen
Unfortunatelly neither I nor Marian could reproduce it. :-/ Closing as worksforme until I encounter the problem again.