* grid: getViewCachedVisibleSize

fixes #78228

* wip: grid hydration first steps

* use more layout state

* grid: remember sidebar position

* layout: remove layoutGrid

* splitview: fix moveView invisible preservation

* grid: addViewAt, moveViewTo

* layout: handle sidebar position

* layout: remove unnecessary layout call

* layout: panel position

* restore strange loop

* layout: status bar and activity bar parts

* 💄

* fix missing calls to setViewVisible

* lipstick

* fix titlebar visibility

* fix editor visibility

* doc

* cleanup todos and use Parts enum

related to #78168

fixes #77884

Part of #74250

- Extend `Disposable` in classes where it makes sense
- Use `DisposableStore` for lists of disposables
- Make `combinedDisposable` take arguments instead of an array (so that you can't pass in an array and then modify the array after the fact)

This reverts commit c01cf1d1.

fixes #67360

related to #50853

related to #50853

We compile using the alwaysStrict flag so these directives are not needed