This reverts commit 2fbc966.

…solute positioning (#5130)

* Update .euiScreenReaderOnly to use clip

- this prevents issues with absolute positioning and scrolling containers, and works on all modern browsers supported by EUI

* Add changelog entry

* [PR feedback] Add comment with more context

* Remove datagrid cell actions onmouseleave

* changelog

…5125)

* Write tests for data_grid_footer_row

* Write tests for data_grid_cell_buttons

* Write tests for data_grid_cell_popover

* Write tests for data_grid_cell

- Uses a non-inline snapshot, since this is a fairly complex component

- NOTE: this is only ~80% coverage, as a lot of the class fns are extremely native DOM specific (focus, etc.) and is better tested in Cypress than Jest

* Write tests for data_grid_body

- They're not great, but there's a lot going on here that probably needs to be split up for more comprehensive unit-focused tests

* [Suggested refactor] Clarify inMemoryValue obj types

- `key` was a little nebulous and I was struggling to figure out what the data structure shoudl look like - I think tweaking the type def naming would help clarify

* [Suggested refactor] DRY out repeated hasResizeObserver

- It's used in two separate places with essentially the same definition
- the `as any` cast doesn't seem to be needed anymore - I'm not seeing typescript errors

* [Suggested refactor] DRY out misc popover content utils

- DefaultColumnFormatter is repeated in DataGridBody and DataGridFooterRow

- Moving the fns to their own util file lets us write unit tests for them instead of having to dive into props and also removes extra complexity from the already-long DataGridBody file

* [Suggested refactor] Move defaultComparator to data_grid_schema

- since comparators are schema related, and data_grid_schema contains several other similar utility exports/fns

- goal is to continue making data_grid_body more encapsulated/focused on (e.g.) display logic and letting other components handle the detailed sort logic

+ unit tests will be written later for data_grid_schema

* Update to account for latest DataGridCell mouseLeave change

+ small comment fix

…e grid (#5136)

* first approach, much better responsivness

* refactor datagrid cell mutation observer to be much more specific at what it is watching

* re-refactoring

* --amend

* finish re-re-refactoring

* Remove console.log, target a custom attribute instead of classname

* function comment

* Update src/components/datagrid/body/data_grid_body.tsx

Co-authored-by: Constance <constancecchen@users.noreply.github.com>

* Update src/components/datagrid/body/data_grid_body.tsx

Co-authored-by: Constance <constancecchen@users.noreply.github.com>

* changelog

* snapshots

* 'revert' change to datagrid.js example

Co-authored-by: Constance <constancecchen@users.noreply.github.com>