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I'm filing this at Petr's request. Pierre Delisle discovered that if you open a JSP 2.0 TLD using the taglib customizer, it shows an inappropriate message (it reports that the TLD must be upgraded to JSP 1.2) and if the user selects OK it corrupts the user's file causing data loss. I file it as a P1 because of the potential loss of data.
We agreed on the solution for 3.6: don't recognize taglibs version 2.0 as tld data objects.
Fixed bug 39926. Right now, only tld v 1.1 and 1.2 are resolved as tag libary descriptor, others (e.g 2.0 tld) are resolved as a normal xml file.
v