1170063 - PDF Viewer no longer honors "mousewheel.with_meta.action" pref to disable page zoom from mouse wheel scrolling

Status: RESOLVED FIXED

(Firefox :: PDF Viewer, defect, P4)

Description

[Chris Peterson [:cpeterson]]

This is a regression in Nightly 40 from bug 1018932. Bug 1018932 fixed PDF Viewer to not zoom the PDF Viewer's toolbar, but now the PDF Viewer no longer honors the non-default "mousewheel.with_meta.action" pref values, documented on the Mozilla wiki:

https://wiki.mozilla.org/Gecko:Mouse_Wheel_Scrolling#Preferences_for_customizing_delta_values_and_default_action

This regression, while annoying, is probably a low priority bug because it only happens with non-default pref values. :)

STR:
1. Change pref "mousewheel.with_meta.action" to non-default value 0 to disable page zoom when using CMD + mouse wheel scroll.
3. Try using CMD + mouse wheel scroll on a regular web page to verify that page zoom scrolling is disabled.
4. Load a PDF file in PDF Viewer, such as http://enterprise-gamification.com/attachments/article/233/Improving%20Software%20Quality%20with%20Gamification%20-%20Full%20Paper.pdf
5. Use CMD + mouse wheel scroll to page zoom the PDF Viewer.

RESULT:
The PDF page is resized!

Comment 1

[Chris Peterson [:cpeterson]]

PDF Viewer regression:

https://github.com/browtayl/pdf.js/commit/34d3b96b52fe95531b0a4ff14659edabcc6ba9ee#diff-dd42e9b2d2a652b8e312efa567698aa6L1984

Comment 2

[Taylor Alexander Brown]

Confirmed in Nightly 41.0a1.