When editing several files in succession it is possible to go back and forth between them in a "ring". The arrows on the history line work almost like a browser would. Clicking on the left arrow goes one direction while the right arrow goes the opposite way.
Remember, this is a ring of files as opposed to the history that you are scrolling through so it won't act quite the same as a browser. In other words, when you select a file from the history list, your position in the ring of files will change to that files previous position in the ring. Going "back" will take you to the file that was previous to the file you are viewing in the ring as opposed to the last file you viewed.
It is possible to add, delete or adjust the order that the files in the ring are viewed by selecting the "Ring editor..." menu item from the "Tools" menu. The ring editor is rather simple and should be easy to use.
Your options are (from left to right in the dialog):
Moving the highlighted file up or down in the ring listing will allow you to shift files into the order you prefer to view them in. You may also delete any file from the listing by pressing the DELETE key while it is highlighted.
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