Mouse wheel zoom has very large steps on Firefox (Ubuntu 16.04)

[ohenrik]

Firefox on Ubuntu (16.04) has extremely large steps when zooming using the mouse wheel, something close to 3x as large as on chrome. Its close not unusable.

I tried reducing the "mousewheel.default.delta_multiplier_y" config variable in Firefox. By setting this down from 100 to 15 i get a scroll speed that is closer to Chrome. However the all scrolling on other pages are slow, pluss i cannot expect users of my website to adjust their scroll settings for Firefox :p

Is there something in D3-zoom i can do to improve this? Is any one else having this issue?

[Herst]

Known browser issue: https://stackoverflow.com/q/5527601/2261442
In the answer to this SO question you will see possible solutions which you can then use you overwrite the default wheelDelta function.

[bhousel]

We implemented a workaround for this in iD:

https://github.com/openstreetmap/iD/blob/f61c482188b1b747fdf528ac2992f6ed9e8a2b6a/modules/renderer/map.js#L376-L396

[Herst]

Another workaround: #157

[mbostock]

Closing as this is well-covered by #157 and the existing zoom.wheelDelta function.