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50949eda56
When computing children of a node in the Packages view, the slowest part is getting the list of subpackages of a given package. Sometimes it happens twice: once to check if the package is empty, then to actually retrieve the list of subpackages to create its children. Fix this part by moving the relevant stuff from PackageUtil to the new PackageNodeBuilder class which caches packages internally. Since this is volatile PSI stuff, we can't cache them between updates, but at least we can cache them during a single node creation, which already makes it twice faster, though still horribly slow. GitOrigin-RevId: adadb24259e43e12a167c4c758a9fb4797058533