OrangeEdit is the most popular editing environment for Robot-programs. A lot of features are supporting you to create and edit KRL programs. You can select a Archive or Path as 'active environment' to get all declared variables and functions into the code competition. It's also possible jumping to a declaration of a selected variable or function by using the context menu 'Go To Definition' or 'F12' key.
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Even Notepad++ is better for diagnosis...