libgtksourceviewmm-3.0-doc 3.18.0-4build1 (i386 binary) in ubuntu focal

 GtkSourceViewMM is a C++ binding of GtkSourceView, an extension to
 the text widget included in GTK+ 3.x adding syntax highlighting and
 other features typical for a source file editor.
 .
 GtkSourceViewMM is crafted to integrate well into applications using
 the gtkmm framework.
 .
 These are the reference documentation for libgtksourceviewmm.