1375914 - Linux: DnD upload not working reliably

Status: NEW

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

Description

[Ralf Jung]

I am testing this on <https://html5demos.com/dnd-upload/>.

Steps to reproduce:
* Take an image file from a file browser (I tried Dolphin and PCmanFM).
* Drag-n-drop it into the rectangle.

Expected behavior:
The image should be displayed in the rectangle.

Actual behavior:
Firefox opens the file.  The URL in the URL bar is now "file:///home/...".

Note:
This is not 100% reproducible.  Taking it slowly my *waiting* a while after entering the rectangle with the mouse seems to help Firefox to "notice" that there's now something being dran'n'dropped.

Comment 1

[Cosmin Muntean [:cmuntean], Ecosystem QA]

User Agent  Mozilla/5.0 (X11; Linux x86_64; rv:56.0) Gecko/20100101 Firefox/56.0
Firefox: 56.0a1, Build ID: 20170626100316

I have tested this issue on the latest Firefox (54.0) release and latest Nightly (56.0a1) build, but I haven't managed to reproduce it. I have opened the provided website from comment 0 and using the File Manager PCmanFM, I dragged multiple images in the "Drag&Drop" area. Every time the images were successfully uploaded. I have tried with ".png" and ".jpg" extensions.
I have tested this on Ubuntu 14.04 x64, 16.04 x64 and also 12.04 x32.

@Ralf, what versions of Linux are you using and on what version of Firefox did you encountered this issue?

Also, can you please retest this issue using a new clean Firefox profile, maybe even safe mode, to eliminate custom settings as a possible cause report back the results?(https://goo.gl/AR5o9d).

Comment 2

[Ralf Jung]

I am using Debian testing amd64 with KDE as the desktop environment.

I tried safe mode, which did not have any effect.

One thing I noticed is that the speed with which I move the mouse seems to make a difference:  When I deliberately move the mouse slowly, everything works just fine.  When I move it really fast, I can reproduce the problem almost 100% of the time.  When I move it the way I usually do (which is still fairly fast), things sometimes work and sometimes don't.

Comment 3

[Cosmin Muntean [:cmuntean], Ecosystem QA]

Sorry for the late response, I was on PTO.

I have retested this issue on Ubuntu 14.04 x64 and I have noticed the following scenarios:
1. If I drag and drop the image really fast, the image jumps back to the File Browser and I can't reproduce the issue. Probably on Debian the behavior is different and you can reproduce the issue every time when doing this.
2. If I drag and drop fairly fast, in 1 from 10 tries I can reproduce the issue. I think the issue is reproducible because when you drop the image and the "drag and drop" area isn't yet focused (green border) the image is not uploaded. I have managed to reproduce this only on latest Nightly (56.0a1) build. 

Ralf, on what version of Firefox did you encounter the issue? Also, can you please try to attach a screen recording with the issue?

Comment 4

[Ralf Jung]

The stable Firefox I tested is 54.  The nightly I just tried (issue persists) is 56.0a1 (2017-07-19) (64-bit).

I will look into screen recording, never did that before...

Comment 5

[Ralf Jung]

Attachment: A video showing the issue

Turns out making a video was easier than expected, even with the additional constraint of not recording my tab bar or the window panel. :)

I did drag'n'drop 4 times in this video: quick, slow, quick, slow.  Only the slow ones work.

Comment 7

[andreas.d.korb]

Any news on this?
I'm still experiencing this with Firefox 82.

OS: Manjaro with KDE