1889438 - Dragging the scrollbar can create a region in screenshots

Status: VERIFIED FIXED

(Firefox :: Screenshots, defect, P1)

Description

[Niklas Baumgardner [:niklas]]

Using the scrollbar to scroll the page while the screenshots UI is open can draw a region on the overlay.
STR:

1. Open a large page that is scrollable. https://en.wikipedia.org/wiki/Sun
2. Open screenshots UI
3. Drag the scrollbar down so the page scrolls (might need to scroll a tiny bit on the page if the scrollbar isn't visible initially)

ER:
No region should be selected because the overlay wasn't dragged

AR:
A region is selected

Comment 1

[Niklas Baumgardner [:niklas]]

Attachment: Bug 1889438 - Dragging scrollbar should not select region in screenshots. r=sfoster

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/84d8a258590a
Dragging scrollbar should not select region in screenshots. r=sfoster

Comment 3

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

https://hg.mozilla.org/mozilla-central/rev/84d8a258590a

Comment 4

[Simona Badau, Desktop QA]

Reproduced the initial issue using Nightly 126.0a1 Build ID: 20240404034404 on Ubuntu 22.04.

Verified as fixed using the latest Nightly 127.0a1 and Firefox 126.0b5 (having screenshots.browser.component.enabled set to true) on Ubuntu 22.04. Windows 10 x64 and macOS 13.