Feature summary (what you would like to be able to do and where):
Add a bool variable with which we can check if the visual editor is used, e.g. visual_editor just like user_mobile.

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):

• Prevent disruptive edits where the visual editor is not used.
• Prevent use of visual editor on some pages.

Benefits (why should this be implemented?):

• It helps making abuse filters more precise. For example many abusers do not use the visual editor, so being able to check for this will help prevent false positives.
• On some pages the visual editor does not work well, so we want to warn/prevent the user from editing those pages with the VE.