For a simple dialog with a single line of text there is way too much of a gap between message and action buttons.
I could reduced the spacing a bit using:
<dimen name="m3_alert_dialog_action_top_padding" tools:override="true">0dp</dimen>
Original spacing:
Reduced spacing:
That's still much spacing but tolerable I guess.
Things could be improved further if we could override the minHeight from contentPanel in m3_alert_dialog.xml which is currently hardcoded to 48dp.
See #4345 (comment).
I guess we would need something like:
<dimen name="m3_alert_dialog_content_min_height">48dp</dimen>
That would allow apps to override it.