Post List Author Filter View Stops Tab Touch Background Fade/Ripple

Expected

The touch background of all views in the top app bar of the Blog Posts screen shows the fade/ripple effect when tapped or long-pressed and the author filter is present.

Observed

The touch background of all views in the top app bar of the Blog Posts screen stops the fade/ripple effect when tapped or long-pressed and the author filter is present. On API 28, sometimes the ripple stops mid-animation and sometimes the touch background is not shown at all. On API's lower than 28, there is no fade/ripple at all and a solid background color is shown when a view is touched. When the author filter is not present or the AppCompatSpinner view is replaced with an AppCompatImageView view, the fade/ripple works as expected. See the animations below for illustration.

AppCompatSpinner	AppCompatImageView

Reproduced

1. Go to Sites tab.
2. Tap Blog Posts under Publish section.
3. Long-press any view in the top app bar (i.e. back arrow, author filter, Published tab, Drafts tab, Scheduled tab, Trashed tab).

Tested

Google Pixel 3 on Android 9.0 with alpha-164 feature/master-post-filters

Start by reproducing the issue from the Sites tab through Blog Posts, using the author filter and long-pressing each top app bar view. Compare the AppCompatSpinner with the AppCompatImageView on API 28 and lower. Done means the fade/ripple appears and completes for all listed views when the author filter is present, without regressing the no-filter case.