1489140 - Browser Console keeps scrolling after releasing mouse click

Status: NEW

(DevTools :: Console, defect, P3)

Description

[Fanolian]

Attachment: Browser Console Scrolling

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0
Build ID: 20180906100252

Steps to reproduce:

1. Open Browser Console. Create enough entries so the scrollbar is present.
2. Click and hold the scroll box/thumb. Do NOT release the mouse click.
3. Move mouse outside Browser Console window.
4. Release mouse click.
5. Move mouse back inside Browser Console.
6. Move mouse up and down.


Actual results:

Browser Console still scrolls despite having released the mouse click.

Please refer to the attached video.
P.s. my screen capture program does not record mouse clicks. Please distinguish different states by the colors of scroll box:
Dark grey: mouse clicked and held
Medium grey: mouse hovering
Light grey: mouse not clicked


Expected results:

Browser Console should not scroll after releasing mouse click.

Comment 1

[Fanolian]

From Mozregression, 
Last good Nightly: 2018-07-18
First bad Nightly: 2018-07-19

regression range is:
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=d94abfaa59928d8fd87f74dbde2ae82d9b7ba667&tochange=d67618d9ba00e9384114989daddbbdc86daf1ad7

Further bisection points to bug 1472599 but I think bug 1469341 may be the real cause.

Comment 2

[Pascal Chevrel:pascalc]

P3, unassigned, marking fix-optional for 63

Comment 3

[Liz Henry (:lizzard) (relman/hg->git project)]

Marking fix-optional for 64. We could still take a patch for 65, and if it's verified and doesn't seem risky, could still take fixes for 64 as well.

Comment 4

[Pascal Chevrel:pascalc]

No update over the last 2 months, updating tracking flags as we get closer to the 64 release.

Comment 5

[Liz Henry (:lizzard) (relman/hg->git project)]

Happy to take a patch in nightly; if it seems low risk enough please feel free to request uplift to 65 beta.

Comment 6

[Mellina Y.]

Hi everyone,

Can I try to solve this issue?

Thanks!

Comment 7

[Nicolas Chevobbe [:nchevobbe]]

Hello Mellina,

You can definitely TRY, nto sure where you should look though.
My guess is there's an event listener on the scrollbar that sets a dragging property or something similar, and that can't catch a mouseup event outside of the window.
Brian, would you have more information on that bug?

Comment 8

[Brian Grinstead [:bgrins]]

(In reply to Nicolas Chevobbe from comment #7)

Hello Mellina,

You can definitely TRY, nto sure where you should look though.
My guess is there's an event listener on the scrollbar that sets a dragging property or something similar, and that can't catch a mouseup event outside of the window.
Brian, would you have more information on that bug?

I'm not sure how good of a candidate this bug is, but I'll forward to Brendan to see if he has pointers on where to start investigation.

Comment 9

[Brendan Dahl [:bdahl]]

(In reply to Brian Grinstead [:bgrins] from comment #8)

(In reply to Nicolas Chevobbe from comment #7)

Hello Mellina,

You can definitely TRY, nto sure where you should look though.
My guess is there's an event listener on the scrollbar that sets a dragging property or something similar, and that can't catch a mouseup event outside of the window.
Brian, would you have more information on that bug?

I'm not sure how good of a candidate this bug is, but I'll forward to Brendan to see if he has pointers on where to start investigation.

I looked briefly, but I'm really not sure what's going on here, so I don't have any good pointers without digging into it.

Comment 10

[u636583]

this issue is still happening in Firefox

changeset:   479096:9b4c8fb46d85
tag:         tip
parent:      479094:e593e11eff08
parent:      479095:adc12b4c5a9d
date:        Tue Jun 18 07:10:14 2019 +0300
summary:     Merge inbound to mozilla-central. a=merge

Comment 11

[Nicolas Chevobbe [:nchevobbe]]

Brendan, since you looked into a browser console issue this week, do you have a better picture of what's happening here? Thanks!