SceneEditor: sidebar drag and drop doesn't work with Firefox

[Ikalou]

Drag and drop in the scene hierarchy, in the sidebar of the scene editor, doesn't work in Firefox.

Chromium:

Firefox:

I tested on Windows 10 and Ubuntu 16.04 with the latest version of each browser. No errors in the console.

I don't think it's an issue with the treeview component itself because the demo (http://sparklinlabs.github.io/dnd-tree-view/) works just fine in Firefox.

[elisee]

Thanks for the report. A few questions:

• What happens instead in details?
• Which version of Firefox are you running?
• Which OS are you running on?
• Any errors in the console? (F12 - Console tab)

[Ikalou]

I updated the issue with more details. What happens is that when I initiate the drag and drop, the item gets selected instead.