Slider response to on-down which is not always desirable

[andrey-git]

Description

The paper-slider responds to down event on the container. This is not always desirable, as the user might be just accidentally putting the finger on the slider while trying to vertically scroll the page.

Expected outcome

Vertical scroll starting at the slider shouldn't update the slider.
Respond to tap event only or make this configurable: tap or down

Actual outcome

Vertical scroll starting at the slider changes slider value.

Live Demo

https://www.webcomponents.org/element/PolymerElements/paper-slider/demo/demo/index.html

Steps to reproduce

1. Put a paper-slider element in the page.
2. Open the page in a web browser.
3. Put finger/mouse on the slider and try to scroll down.

Browsers Affected

All

[NovapaX]

This is simply fixed by changing

paper-slider/paper-slider.html

Line 347 in 75c87eb

on-down="_bardown"

to on-mousedown="_bardown"
This is actually how it should behave from a UI/UX standpoint. (none of the sliders I've tried anywhere capture and act on touchstart on the bar on a touchscreen.)