libgtksourceview-2_0-0 from home:heikkiyp:windowmanagers project
Select Your Operating System
Add repository and install manually
For SLE 12 SP2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:heikkiyp:windowmanagers/SLE_12_SP2/home:heikkiyp:windowmanagers.repo zypper refresh zypper install libgtksourceview-2_0-0