Is there Split Pane support in Gedit?
Solution 1:
In gedit, choose Documents > New Tab group or Ctrl+Alt + N your gedit will split vertically. And you can drag tabs.
Solution 2:
Update: Gedit has now added this feature. I'm keeping my answer around for those using older versions of the application.
Gedit does not come with this feature.
But there is a plugin you can get: http://live.gnome.org/Gedit/Plugins#line-505