This reverts commit c0aac757

Current implementation of getModifiedPaths and getRenamedPaths for unparsed changes is not zero-cost. So it makes sense to have a fast size method to determine whether or not a commit can be shown in change browser.

[vcs-log] do not automatically show changes if one of the selected commits has more of them than the specified limit

We used to implicitly rely on PyTypingTypeProvider.getClassType() for this purpose
that, in turn, uses normal resolve machinery of a PyReference. But it (rightfully)
didn't work for references inside fragments created from text of alias RHS parts
as we prohibit resolving in them to avoid unstubbing of their containing files.

Issue: IDEA-206881

Issue: IDEA-203790

Easier to use just one key

Extract interface

Extract PR list model, make loader implement it
Rename components to panel+holder where applicable
This will simplify refresh since we won't have to update data in multiple places or call methods on UI panels

follow-up: 3f2a08e0

Dmitriy Panov

clearSubscriberCache uses O(numberOfModules) time to clear caches.
If we're creating a lot of MessageBuses (like loading of a project model) it leads to O(numberOfModules^2) operations. IDEA-CR-43553

avoid treating strange long hangups in newer JDKs in Unsafe.unpark() in FutureTask.finishCompletion() as leaking threads