Zoom is too sensitive on OS X

[staktrace]

(Filing this as an upstream bug for https://bugzilla.mozilla.org/show_bug.cgi?id=1392361)

Link to PDF file (or attach file here): https://www.library.yorku.ca/spark/books_journals_more/PARCA%20Test_Final.pdf (or any PDF)

Configuration:

• Web browser and its version: Firefox 55+
• Operating system and its version: OS X 10.11.6
• PDF.js version: Whatever's in Firefox now
• Is an extension: no?

Steps to reproduce the problem:

1. Load PDF
2. Pinch zoom on macbook trackpad, or scroll using ctrl+two finger pan

What is the expected behavior? (add screenshot)
Page zooms gradually

What went wrong? (add screenshot)
Page zooms far too much

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

[lizzard]

I'm also seeing this problem on MacOS 10.12.6 with default zoom/pinch system settings.

[schneeschmelze]

The error still is there in Firefox 59.0.2 on El Capitan. I'm surprised the bug was marked as wontfix for FF57 on Bugzilla. It should have been solved for the next ESR release…

[schneeschmelze]

For the record: No change in Firefox 60. :(

[davidanderle]

I'm having the same issue on Windows 10. Zooming with pinch is too sensitive.

[dimonoid]

Windows 10 1703, still the same. Carbon X1 4th gen

[lxieyang]

Same on macOS 10.14. Too sensitive.

[Nariety]

Firefox 68.0b3, the issue still persists. The pdf touchpad zooming is too sensitive to the point where it's unusable.

[bubblefoil]

I may have a related issue. I use a Logitech mouse with smooth scroll feature. With Logitech SetPoint extension the browser correctly interprets mouse wheel events with decimal deltaY, e.g. 0.025, and scrolls perfectly smoothly. It also handles ctrl-wheel zoom quite well. But PDF viewer does not. It does either nothing or zooms way too much.
I've tried logging wheel events. Indeed, there is many of them with small delta.

[dimonoid]

Can confirm. It is still an issue on ThinkPad x1 carbon 4th gen. Whel using either track point or trackpad. When I use mouse wheel instead, it works just fine.

[allison-lowe]

still not fixed

[moeenio]

Yeah, still present, firefox 75

[ViacheslavLabs]

Still not fixed, firefox 78

[dimonoid]

Windows 1909, ThinkPad x1 carbon 4th gen, still not fixed

[Shararazer]

Still there in MacOS 10.15.6 and Firefox 78.0.2 and no update from Firefox support either.

[moeenio]

:O

[bubblefoil]

In the version linked in the pull request, mouse wheel zoom on Windows does not work at all.

[staktrace]

In the version linked in the pull request, mouse wheel zoom on Windows does not work at all.

Can you provide more specific details - Are you using pdf.js standalone, or in Firefox? If so, what version of Firefox? What kind of mouse hardware do you have?

[bubblefoil]

In the version linked in the pull request, mouse wheel zoom on Windows does not work at all.

Can you provide more specific details - Are you using pdf.js standalone, or in Firefox? If so, what version of Firefox? What kind of mouse hardware do you have?

I opened the first of the 2 links in this post in the latest FF version by that time. It just updated to 80.0 so the one before that.
#12203 (comment)

I have Logitech M705 with enabled smooth scrolling.