I just had this issue as well and it turned out it was just the unity link file that needed to be updated. The link was created before I registered sublime so the link name gets created with the UNREGISTERED
string.
I was able to fix this by modifying the link file.
vim ~/.local/share/applications/sublime_text.desktop
You can then change the Name=
entry
[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
Name=Sublime Text -- UNREGISTERED
Icon=sublime_text.png
Exec=/opt/sublime_text/sublime_text
StartupNotify=false
StartupWMClass=Sublime_text
OnlyShowIn=Unity;
X-UnityGenerated=true