Script gets replaced with the @required script

[JasonBarnabe]

From here.

• Install https://greasyfork.org/scripts/103
• Edit the script, add: // @require https://greasyfork.org/scripts/216/code.user.js?06, save and close the editor.
• Greasemonkey warns about @grant, close that.

The script in the add-ons manager now shows up with the name and description of the script @required. Attempts to edit the source are unsuccessful with this showing in the Browser Console: NS_ERROR_FILE_TARGET_DOES_NOT_EXIST: Component returned failure code: 0x80520006 (NS_ERROR_FILE_TARGET_DOES_NOT_EXIST) [nsIFile.isFile] in resource://greasemonkey/util/getContents.js.

[Ventero]

Ventero@dc19a22 is a possible fix for this. This also fixes the minor issue of leaving an empty temporary directory behind after moving all dependency files over.

Semi-related: While debugging this, I also noticed that whenever all @requires are removed from a script, it's injected twice. Ventero@2c07687 fixes this.