Edit Xcode color scheme for line number background -

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anyone knows how change line number background color in xcode, referring area in red box below? access setting by:

xcode -> preferences... -> fonts & colors

i read through .dvtcolortheme file haven't found hint.

enter image description here

unfortunately seems line number/gutter area given background colour automatically based on background of editor is. can seen changing editor's background colour white or black, , chooses both darker colour white, , lighter colour black.


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