I want to add vertical separation between the bottom row and the rest of the rows. To achieve this, I added a dummy row to my custom layout like so:

<row height="0.2"/>

Expected behavior

A row of empty space of height 0.2, which should be a fifth of the size of rows with default height

Actual behavior

The empty space does show up, but it's too big relative to other rows. After some testing, I'm seeing that the shortest rendered height is 0.5, which seems to be a hard-coded minimum introduced in commit 45fc185.