eliosh,
Thank you for working with CodeMix and DevStyle.
Can you please right click in the left margin in the editor area and check if ‘Show Quick Diff’ is unchecked?
If it is unchecked, then please select it to enable it. Alternatively, you can use the keybinding ‘Ctrl+Shift+Q’ in the editor area to enable/disable it. Once checked, you should now see the highlight in the left margin for the code that changed.
Hope this helps. Please let us know how you get on with it.
–Swapna
Genuitec Support