I have been compiling PA for a few weeks now for the Samsung Galaxy Mega 6.3. But I have not been able to get the pie controls activated in the last 2 builds. The youtube video shows that the pie gets activated automatically when immersive mode is set.
But I do not get a popup to that effect. I tried adding this commit but ended up with a compile error.
device/samsung/melius-common/overlay/frameworks/base/core/res/res/values/config.xml:259: error: Resource at config_allowPieWithoutNavbar appears in overlay but not in the base package; use to add.