Correct color extraction on App Widget drop.

Disable color extraction on drop until the workspace is back to its
normal size, then re-enable it and force re-coloring. This needs to
happen if the drop is on the workspace, but also if the drop is on the
secondary target.

Fix: 192354264
Test: Manual, see bug for details.
Change-Id: I79203f68843d59384503aa76f4813d886e98afa3
Merged-In: If573641e4bb5a98ed6b5008e00f70f4bbe492c24