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In the Java editor, when you use a class you haven't imported, it offers a fix to import that class. It would be nice if the JSP did something similar, only for JSP tags. For instance, if I paste code into a JSP which uses <c:forEach>, it should warn me that no such tag exists, then offer a fix which will add a taglib JSP directive for JSTL Core to my page. (Not to be confused with issue 164757, although if a "Fix Imports" feature is ever implemented for Java code in a JSP file, it should "Fix Taglibs" too.)
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss