docs-bug(CdkOverlay): Overlay scroll strategies do not work unless main body is the scroll

[dwilches]

Documentation Feedback

The documentation for CdkOverlay doesn't mention the ScrollStrategies only work if the window object is the one scrolling. As explained in this bug report: #6157 in order to make it work for other scrollable elements, one needs to use the cdk-scrollable attribute, but this is not mentioned in the documentation.

Could you add an explanation of it there?

Also, I notice even setting cdk-scrollable doesn't make the block strategy work with non-window scrolls. So I think even more documentation is missing about how to make all this work.

Affected documentation page

https://material.angular.io/cdk/overlay/api