Nav Drawer retains high z-index when position is relative

[damyanpetev]

Description

When using a relative Nav Drawer (say in a combination with Nav Bar) the drawer still retains the z-index of 999 as if it was in overlay mode. Small oversight when introducing the overrides for relative position, but it's extremely visible in the Material theme as it clips the Nav Bar's elevation shadow:

Steps to reproduce

1. Open the attached sample
2. Observe the Nav bar's shadow

Result

The drawer is still using the high z-index and clipping other content, when it shouldn't.

Also I noticed the Nav Bar does have z-index: 4 on it's base part but that doesn't seem to work for some reason unless I move it to the :host. Same approach works for the drawer, so not sure what's up with that, so @simeonoff let me know if I should log that separately

Expected result

We should reset the z-index when in position relative

Attachments

wcNavBarAndDrawer.zip