fix(magnification thumbnail): fix thumbnail area wrong when IME opens or orientation changes

This is because it was still using the old width/height from before
the layout change.

Fix: b/279538599
Fix: b/279527264

Test: manual
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:1a8ebc95c1a373b01bdf5db2e485d0a6971dae87)
Merged-In: I9f3cd40d9caba2a19ca93e1f87ff217840da771b
Change-Id: I9f3cd40d9caba2a19ca93e1f87ff217840da771b