1211539 - Page can't be scrolled by clicking on free space in slider, if mouse moves

Status: NEW

(Core :: XUL, defect)

Description

[arni2033]

Attachment: video - Page can't be scrolled by clicking on free space in slider, if mouse moves.webm

STR:   (Win7_64, Nightly 44, 32bit, ID 20151005030206, new profile, safe mode)
1. Open the following "data:" url or click URL in the form above
>   data:text/html,<style>body{height:10000px;}
2. Make sure that scrollbar on that page is placed near the upper scrollbutton
3. Click on the slider near the lower scrollbutton and keep moving mouse up and down

Result:       scrollbar moves down only 1 time, and it moves further only when you stop moving the mouse
Expectations: This is not consistent with any other Windows application's behavior.
              Scrollbar should move down if mouse is pressed and is placed over the slider.

Basically, I don't *always move mouse* when want to scroll a page, but sometimes it happens accidentally and causes delays in scrolling.

Comment 1

[arni2033]

Still happens on:   Win7_64, Nightly 48, 32bit, ID 20160324030447