EuiInMemoryTable ignores initial pagination props

[igoristic]

This isn't really related to #1007, since this is affecting initial props. So, if the component starts out with anything other than its default/initial pagination prop eg:

const pagination = {pageIndex: 2, pageSize: 10};

<EuiInMemoryTable
  pagination={pagination}
  ...
/>

I think it's because getInitialPagination does not return anything if pagination does exist:
https://github.com/elastic/eui/blob/master/src/components/basic_table/in_memory_table.js#L95

Maybe reimplementing it to something like this might fix it:

const getInitialPagination = (pagination) => pagination || {};

[chandlerprall]

I'm unable to replicate this issue, can you provide a demo of the bug (e.g. with https://codesandbox.io)?

For testing, I've added

pagination={{ initialPageSize: 4, pageSizeOptions: [2, 4, 8] }}

to the example at src-docs/src/views/tables/in_memory/in_memory.js and get this result:

[igoristic]

Please try it with:

pagination = {pageIndex: 2, pageSize: 10};

In some cases we want to initiate/start a table at page 3 for example.

This relates to elastic/kibana#32663, unfortunately angular does not update react components but instead redraws them anytime there is a change from the scope

[chandlerprall]

Ah, gotcha. I mis-read your pageIndex: 2 key/value.

[chandlerprall]

re: https://github.com/elastic/kibana/pull/34565/files#diff-f5c2be5f354e6067ab8d71ff231e2077

I can't see us changing the names of these props (so the mapping in the above PR will need to remain), but it does make sense to support an initial page index.