gtksourceview
GTK+ Source Editing Widget
GtkSourceView is a text widget that extends GtkTextView, the standard GTK+ text widget. It improves GtkTextView by implementing syntax highlighting and other features typical of a source editor.
There is no official package available for openSUSE Leap 15.5Distributioner
openSUSE Tumbleweed
SUSE SLE-15-SP2
Unsupported distributions
The following distributions are not officially supported. Use these packages at your own risk.