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Select "Tools -> Option -> Editor tab -> Formatting tab". in this window available only "All languages" and "PHP". I have set tab spaces on '2' only for HTML and CSS editor. For PHP and JavaScript editor - set '4' spaces. Please, add this options in dropdown menu. Thanks!
This must be implemented in separate modules, reassigning to HTML since it is first in the list
*** This bug has been marked as a duplicate of bug 144164 ***