* Use `git status` instead of `git ls-files` to properly support Deleted-Deleted conflicts.

* Allow to veto attempts to close FrameWrapper
* Move bottom buttons into center panel, removing hack with overridden `DialogWrapper.createSouthPanel()`

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

IDEA-208728

1. Index compiled trait field annotations.
2. Add annotations from compiled trait field index to the compiled trait field.
3. Copy annotations from underlying field (e.g. compiled trait field) to the GrTraitField.
4. Run DelegateTransformationSupport after TraitTransformationSupport, since the latter one may (and will) add more
fields to the class.
5. Use context fields in DelegateTransformationSupport instead of code fields, since new fields with @Delegate might be
added during transformation process, e.g. by TraitTransformationSupport.

- explicitly close channel on external pipe close
- - avoid log pipe threads endlessly waiting for channel which is not live anymore
- add more LOG.debug
- - delegate to CloudAgentLogger outside of agent
- - guard calls to CloudAgentLogger since crossing agent boundaries is expensive

We should update layout after changing the "mySupportsCompression" flag,
just like we update it on "hideTabsIfNeed" settings change.

JBEditorTabs sets `mySupportsCompression` flag in constructor,
but it is used in super constructor via `createSingleRowLayout` method.
Thus, initial state of "hideTabsIfNeed" flag was ignored as "unsupported".

* Remove state from GitInteractiveRebaseEditorHandler (as its Closeable was ignored by everyone)
* Remove dangling Disposable from `GitRebaseEditorService.registerHandler`
  (fix another instance of IDEA-208453)
* Use try-with-resources to pass editor handlers to GitHandler

follow-up: 509fead2

This also fixes GitRewordTest, as server might not be started in UnitTestMode
after 22883f65.

follow-up: cc4275f2

navigate to testdata: NavigateToTestDataAction.findTestDataFiles should return found elements if they're exist

Refresh optimization: when new directory created, load all children eagerly because that's what basically all VFS listeners do anyway (but in EDT), which hurts (especially local history). This optimization supersedes the previous "empty directory" flag in VCreateFileEvent.

fix javadoc references in com.intellij.ui.tabs.JBTabsPresentation#setPaintBorder. Implement new Editor Tabs UI (#IDEA-205489)