* adopt in tests

* adopt more join() that are straight forward

* more safe usages

* more adoption

* partially functioning grid view

* lots of toggling behavior and editor restore

* dimension changes

* restore layout and fix titlebar

* fix view dimensions on toggle/move

* increase timeout for debug config

* undo unnecessary changes to CSS

* put grid layout behind setting

* fix strict null checks

* address code comments from @bpasero

* changing key name

Many `Promise.resolve(null)` should actually be `Promise.resolve(void 0)`. In other cases, we were missing a null return annotation.

These methods return an IEditor as a result but even if the opening fails or the editor was not opened as active.

The fix is to check for the result of the open call and only return the editor if the editor was opened actually.

This restores the behaviour we had before GRID.

fixes #64767

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

This reverts commit f25e9c10.