platform_frameworks_support

Note: I've seen the existing question titled "Align Snackbar's Action on the right", however this does not address my particular question.

According to the material design spec the action in a snackbar should be right/end aligned. The default behaviour on smaller screens seems to work as expected (full width of screen, action is aligned to the right of the screen), but on tablets I'm seeing the action immediately next to the description/title text with some padding. Example here:

Snackbar action position example

I've seen this on a real Nexus 9 (api 25), and 3 emulators (api 22, 23, and 24) in both portrait and landscape.

The layout xml for the snackbar contents in the Android source (design_layout_snackbar_include.xml) seems to suggest the action button should be right/end aligned so I'm a bit baffled as to why I'm not seeing this.

I first saw this occurring in one of the apps my company is developing, and I've now made a test app to reproduce the issue (which I used to produce the example image linked earlier). All the app does is display "Hello World!" in an activity, and when the back button is pressed a snackbar is shown to confirm the action. My test activity looks like this: