Gedit plugin to go to last/next document
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It should add two toolbar buttons: back and forward. The Back button goes to the "last position" in the last document; the forward button can be used to "undo" this (as seen in Visual Studio).
In addition, maybe a "Go to last edit position" button might be useful as well (as seen in KDevelop).

What should be a separate "history entry":
- switching to another document, or opening a document
- clicking somewhere in the document, thereby moving the cursor
- moving the cursor with keyboard, and starting to edit at least N lines away from last edit position (with N being something like "half a screen height")
- probably all cursor movements not initiated by the user should be counted as separate history entries (this should catch cursor movement initiated by plugins)