material-renderers: Validation Icon on individual ExpandPanel, ListWithDetail items

[vishnutsivan]

Validation icons on individual List with details item

Validation icons on individual Expand panel item

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[coveralls]

coverage: 82.497% (-0.08%) from 82.573%
when pulling fec759b on vishnutsivan:validation-icon
into d0b1dfa on eclipsesource:master.

[lucas-koehler]

Thanks for the contribution ❤️ This looks useful to me :)
As we are currently busy with the 3.6 release, we'll have a look afterwards.

[lucas-koehler]

Hi @vishnutsivan , thanks again for the contribution! The changes generally look reasonable to me and the feature is useful :)

I have one comment inline. Please have a look.

Also, for the validation icon in the master list item, there should be a little more space between the validation icon and the text. Furthermore, the validation icon should be vertically aligned with the text. I.e. see the screenshot below where the icon and text do not align and are very close together.

[lucas-koehler]

This should be the raw errors of type ErrorObject[] instead of the processed string for two reasons:

1. To be consistent with the behavior of the array mapper in mapStateToArrayControlProps
2. To allow renderers to decided for themselves how to show the errors.