Components: Expansion-Panel with multiple levels of nesting

[Belka383]

Bug, feature request, or proposal:

Feature request!

What is the expected behavior?

It is necessary to rework the component Expansion-Panel or make another component with which you could build a hierarchy. That is, when expanding the first line, others should open with the same behavior - or the opened lines can also be expanded or contain static text.

What is the current behavior?

When you try to insert Expansion-Panel in Expansion-Panel now it does not work properly - the nested opens not equal to the outer (indents appear).

What are the steps to reproduce?

StackBlitz starter: https://stackblitz.com/edit/angular-material2-issue-kfjnu3

What is the use-case or motivation for changing an existing behavior?

It is necessary to use the menu in the form of a hierarchy in the project - it is important to know the level of nesting!

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

this is not a bug

Is there anything else we should know?

no

[jelbourn]

We don't have any plans to support nesting of expansion panels, but the upcoming tree component will support expand/collapse with a hierarchical set of data.

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