gtksourceview3: gtksourceview (a GTK+ framework for source code editing) gtksourceview3: gtksourceview3: GtkSourceView is a portable C library that extends the standard GTK+ gtksourceview3: framework for multiline text editing with support for configurable gtksourceview3: syntax highlighting, unlimited undo/redo, UTF-8 compliant caseless gtksourceview3: searching, printing and other features typical of a source code gtksourceview3: editor. gtksourceview3: gtksourceview3: gtksourceview3: gtksourceview3: