Moving of tabs between terminal windows is not working

[Christian Wolf]

In gnome-terminal you can split a window containing multiple tabs (terminals) and merge again. See http://askubuntu.com/questions/409062/is-it-possible-to-merge-multiple-gnome-terminal-windows-into-a-single-tabbed-vie and http://askubuntu.com/questions/43114/merge-split-terminal-tab-back-into-one-terminal (also with video).
This behaviour is expected.

Now if I open two terminals. One by pressing <Ctrl>+<Alt>+<T> and one from nautilus with "open tab here". Now it seems impossible to move tabs from one window to the other. The moved tab just gets placed in a completely new window instead of the widow it was dropped onto.
From either terminal I can split and merge again. Also opening a new terminal in the same fashion seems to be compatible as far as I can see.

Further system information:

Description: Ubuntu 14.04.3 LTS
Release: 14.04

nautilus-open-terminal:
  Installiert: 0.20-1
  Installationskandidat: 0.20-1
  Versionstabelle:
 *** 0.20-1 0
        500 http://de.archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages
        100 /var/lib/dpkg/status