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Change the background color of the very left part of the editor (where the code folding stuff and the new/updated/removed colored marks appear). Add a separation line to better understand where the code text begins. Let the user to alter (via application settings) both background and line colors).
The background color of code fold can be customized in Options-> Fonts And Colors -> Highlights -> Code Folding Bar
Yes, but now this is somehow "hidden" by the bar containing the new/updated/removed colored bars. If it was possible to integrate in the same preferences also this bar will be nice. A vertical line will be the final artist's touch.