I can't reproduce this in Safari 8.0.4 on OSX.

How do you "Drag and drop text"? I've no idea what that means, at least trying it in Chrome and Firefox, it's not possible on any site?

Here's how I do it in Safari:

• Select any text.
• Click and hold the selected text without moving your mouse. On OSX, you have to hold this click for about a second or a second and a half for the OS to recognize it as "drag" instead of "select".
• After a second or two, drag it around.

I can reproduce the report only in Firefox; Chrome and Safari work fine for me.

In a browser or text from somewhere else, I can't even get this to trigger. I've honestly never heard of this in 20 years of building web pages.

Haha, ok, after like 10 tries I got it. Takes longer for me to use that mechanic than simple copy/paste.

Yeah, I'm pretty sure I've only ever used this by accident.

The issue doesn't appear in the current code base with Firefox 73. That's not unexpected, as the UI has been tweaked several times between 2015 and now.

So we can mark this resolved I guess (I'm not sure a git bisect to identify the solving commit is useful for such a trivial thing)?