IssueTracker

So right now there is a limit of 30dp for elevation so this should work. Can you check if increasing padding at the bottom of the compose view fixes it? If yes, you might be facing an issue where there is another view in the hierarchy that is missing the following parameter android:clipToPadding="false"

Adding padding of my own does fix the problem. None if the windows in the window clip their children but a few does have clipToPadding enabled (the compose view, the content FrameLayout and the decor view).

One problem seems to be that Dialog assumes that if you have an elevation of 30dp then the shadow length will also be 30dp which I don't think is correct. I believe the shadow length is proportional, but not linearly so, to the elevation.

I don't think Dialog assumes shadow length. Dialog reserves a space for 30dp of elevation and lets the framework decide how much is that. The limit could be configurable in the future. It's honestly pretty tricky case and we struggled to find a more general solution for this.

Hmm, how is this intended? I feel like what I am doing is pretty standard; a dialog with elevation which is the Material Design recommended look for an alert dialog.

I believe this should be revisited, even if it's just by adding more padding.

Your bug was about shadow being clipped. That was not an issue in the dialog but in the parent views clipping it as adding the padding fixed the issue.

Well the parent views are all system views and not something I create myself so I still see this as a Compose bug

The ComposeView has clipToPadding set to false. At least that's what I see here in the source code. Any parent view / Activity above ComposeView is outside of control for Compose. Or to put it in other way, Compose can't just override it on the Activity and hope that was intended.

The dialog is inside a window that is created by Compose itself. There are no other views created by me. Compose's Dialog function creates this window so it's reasonable that it would also fix this issue for us.

It's not clipped by the window but by the Activity

I don't think so, the dialog is displayed in a separate window and is unaffected by the activity's window.

Here is where we set the max elevation for Dialog - this seems to work for smaller elevation, so I wonder if we are running into an upper bound for how much extra space we can allocate with this workaround.