For me this does not only happen when applications are draged to the launcher. Tuxguitar and Shotwell never show in the launcher, whereas the behavior is different. When I go backt to the Dash and klick on the icon, in the case of Shotwell the already open window shows. Tuxguitar however opens a new window. This means, whenever I have a Tuxguitar window in the back, it stays there. Forever and ever ...
For me this does not only happen when applications are draged to the launcher. Tuxguitar and Shotwell never show in the launcher, whereas the behavior is different. When I go backt to the Dash and klick on the icon, in the case of Shotwell the already open window shows. Tuxguitar however opens a new window. This means, whenever I have a Tuxguitar window in the back, it stays there. Forever and ever ...