1351028 - Eyedropper doesn't move if page stops 'mousemove' event (e.stopImmediatePropagation())

Status: NEW

(DevTools :: Inspector, defect, P2)

Description

[684sigma]

I have a problem with Firefox Beta 52. It also happens in Beta 53, Nightly 55. Doesn't happen in ESR 45.
I noticed that on some pages eyedropper doesn't allow me to grab a color from page in some areas. I immediately created an example of such area. I'm not sure if this example is exactly what happens on those sites, but I'll check them once this bug is fixed. Here's how to reproduce it:

1. Open console, execute "onmousemove=e=>e.stopImmediatePropagation()"
2. Enable eyedropper in inspector, move mouse over the page

Result: Eyedropper doesn't move
Expected: Eyedropper should follow mouse pointer

Comment 1

[Mike Taylor [:miketaylr]]

Would it be possible to upload a minimal test case (i.e., a small webpage) displaying the bug? You can break a lot of things by typing stuff in the console. :)

Thanks!

Comment 2

[684sigma]

Attachment: e.stopImmediatePropagation() kills eyedropper, by reporter.html

Sure.

Comment 3

[Mike Taylor [:miketaylr]]

Attachment: eyedropper.html

Thanks for the TC! Modified it a bit to add some elements with colors so it's easier to see the problem.

Comment 4

[Patrick Brosset <:pbro>]

Maybe bug 1177346 would help? The problem seems to be that if any page suppresses events with stopImmediatePropagation then any highlighter using the event would be broken.

Comment 5

[Gerry Chang [:gchang]]

Too late for 54 as 54 was released.

Comment 6

[Nicolas Chevobbe [:nchevobbe]]

Still happens