libgedit-gtksourceview-300-common 299.0.4-0ubuntu1 (amd64 binary) in ubuntu mantic

 libgedit-gtksourceview is a library that extends GtkTextView, the
 standard GTK widget for multiline text editing. This library adds
 support for syntax highlighting, undo/redo, file loading and saving,
 search and replace, a completion system, printing, displaying
 line numbers, and other features typical of a source code editor.
 .
 This package contains the language specifications files for Ada,
 C, C++, C#, CSS, ".desktop", ".diff" (patch), Fortran 95, GtkRC,
 Haskell, HTML, IDL, ".ini", Java, JavaScript, LaTeX, Lua, MSIL,
 Nemerle, Pascal, Perl, PHP, ".po" (gettext), Python, R, Ruby, sh,
 SQL, Tcl, Texinfo, VB.NET, Verilog, VHDL and XML.