1385958 - JS - files drag-n-drop not working properly with e10s

Status: UNCONFIRMED

(Core :: DOM: Copy & Paste and Drag & Drop, defect, P3)

Description

[timo vn]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:56.0) Gecko/20100101 Firefox/56.0
Build ID: 20170728084721

Steps to reproduce:

I’m using a drag-n-drop script that is doing nothing when using Nightly (56.0a1) in a e10s window.

It does work fine using a "non-e10s window" and in Firefox 54 Stable.

This non-behaviour can be experienced even on the examples given on the MDN page : https://developer.mozilla.org/en-US/docs/Web/API/DataTransfer/files


Actual results:

Nothing.

The JS object "event.dataTransfer" is "null" (according to the web develleper tools in Firefox).


Expected results:

The "event.dataTransfer" should not be "null" and the "event.dataTransfer.files" should contain the list of files.

Everything works fine in Firefox 54 Stable or in Nightly inside a non-e10s-window.

Comment 1

[Neil Deakin]

I don't see this issue on Linux. Can you provide a testcase showing the issue?

Comment 2

[Firefox Bug Husbandry Bot]

https://wiki.mozilla.org/Bug_Triage/Projects/Bug_Handling/Bug_Husbandry#Move_fix-optionals