Build info:
CrOS 10323.15.0, 65.0.3325.39

Videos related to this issue in the link below:
https://pantheon.corp.google.com/storage/browser/chromiumos-test-logs/bugfiles/cr/809314/

This is also happening to PDFs via the Chrome browser, so redirecting to the PDF team to take a look.

When the File Manager opened the PDF in quick view, it sets the zoom to a specific level. When this happens, the zoom stays at the specific level. The File Manager needs to open the PDF Viewer in Fit-to-width or Fit-to-page mode. Then the PDF Viewer will get the desired behavior.

thanks thestig@! fukino@ could you please take a look?

Moving back to M66 to investigate.

WIP CL: http://crrev.com/c/984912

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e0fb2a3bc358481049677a2aec556ef8d5d81120

commit e0fb2a3bc358481049677a2aec556ef8d5d81120
Author: Naoki Fukino <fukino@chromium.org>
Date: Wed Apr 04 09:45:09 2018

Files app: Preview PDF file in fit-to-page mode in quick view.

Instead of using the default zoom level, we can set fit-to-zoom mode by default
to resize the preview automatically when Files app window is resized.

Bug:  809314 
Test: Manually tested
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I6e8d2113c9bbbd65071de2191f4be37b62ef6fd0
Reviewed-on: https://chromium-review.googlesource.com/984912
Reviewed-by: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Commit-Queue: Naoki Fukino <fukino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548013}
[modify] https://crrev.com/e0fb2a3bc358481049677a2aec556ef8d5d81120/ui/file_manager/file_manager/foreground/js/quick_view_controller.js

Verified on Chrome OS 10575.26.0, 67.0.3396.31