Fix stuck if resize split quickly

This is caused by a new resizing transition starts before the
previous transition finished.

Fix this by disabling interacting with the divider bar during
resizing and always cancel the previous transition.

Fix: 269425665
Test: manual
Test: pass existing tests
Change-Id: Id74ac119f8b4d574f3e82b3784b0f42c5db95ce0
(cherry picked from commit 4cead1a66c96cc4e69f0a4359e1b27bc98fd1dc9)
Merged-In: Id74ac119f8b4d574f3e82b3784b0f42c5db95ce0
6 files changed