Change Tracking
When you are in the midst of editing a source code file, it is tremendously useful to understand which lines of code have been committed (that is, saved to disk) and which have not. Change tracking provides this functionality; a yellow vertical bar in the text editor’s selection margin (and vertical scrollbar if enabled; see the prior chapter) spans any lines in the editor that have been changed but not saved. If content has been changed and subsequently saved, it is marked with a green vertical bar in the selection margin.
By looking at the yellow and green tracking bars, you can quickly differentiate between the following:
Code ...
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