Added support for gtksourceview2 module (pygtksourceview 1.90.x) in
gitview. Also refactored code that creates the source buffer and view.
Signed-off-by: Frederick Akalin <akalin@akalin.cx>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>