Anytime I write a variable's name I get this annoying IDK green or yellow highlight . What is it ? how to get rid of it?
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I know this is an old question but I thought what I have discovered might help others. :)
I had the same annoying problem and no matter what I could not remove the highlighting with the Tools->Fonts & Colours option mentioned here.
What actually did work is the Tools->Editor->Highlighting and turn off the "Mark Occurrences of Symbol Under Caret".