Magellan with data-offset does not trigger correctly on the first item

[mingyeungs]

What should happen?

Magellan with data-offset should should be triggered at offset positions

What happens instead?

All menu items, but not the first one, is triggered at the correct position.

Possible Solution

update /js/foundation.magellan.js line 170:

from
if(newScrollPos < this.points[0]){ /* do nothing */ }

to:
if(newScrollPos < this.points[0] - this.options.offset - (isScrollingUp ? this.options.threshold : 0)){ /* do nothing */ }

Test Case and/or Steps to Reproduce (for bugs)

Test Case: https://codepen.io/mingyeungs/full/oRerpB

Your Environment

• Foundation version(s) used: 6.5.1
• Browser(s) name and version(s): Chrome 74.0.3729
• Device, Operating System and version: macOS High Sierra (10.13.4)

Checklist

• I have read and follow the CONTRIBUTING.md document.
• There are no other issues similar to this one.
• The issue title and template are correctly filled.

[JPustkuchen]

Yup, we can confirm this problem! Any chance to fix this?

[thomasfrobieter]

I can confirm that @mingyeungs fix works fine!