Properties view expansion no longer tied to hierarchy view expansion.

If an element is selected in the hierarchy view, its properties are
displayed in the property view. If the element is subsequently collapsed
in the hierarchy, the properties remain expanded.

Test: Run a WM trace. Select an element in the hierarchy view. Check
its properties are visible. Collapse the element. The properties should
not collapse.

Bug: 187320866
Change-Id: I7b8fab7d5fa5e502ff1668381be42259a421431c
1 file changed