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When showing file list in go to file window it loads icons for all elements in EDT, it requires MIME type resolution and may be very slow in some cases (e.g. XML files) causing UI hangs. This could be reimplemented like it was done in favorites and other file trees - the list appears with empty icons and then they lazily refreshed with actual icons as the data arrives.
Created attachment 124713 [details] stacktrace
Fixed jet-main 8345e96838f6