Allow long-press on workspace immediately after dropping.

Previously the touch was consumed until the transition from
spring-loaded to normal workspace finished, leading long
presses to trigger on the background rather than on apps.
This made it difficult to move multiple icons consecutively.

Bug: 29631912
Change-Id: I259e618c81f56bc40d08a5d63ddbbf3c82a76baf
2 files changed