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Currently, in order to provide the default XML navigator for files whose MIME types end in +xml (such as text/x-springconfig+xml) one has to explicitly register org.netbeans.modules.xml.text.navigator.XMLNavigatorPanel for that MIME type. The navigator support does not infer to use the navigator for text/xml if a navigator is not registered for the more specific MIME type. There are quite many files using the +xml suffix, and all of them need to have this dependency on xml.text. Ways to address include adding special support to core/navigator for handling the XML MIME types, or providing an API in xml.text to return the default XML navigator. However, there is already support in the IDE for infering text/xml from a "+xml" MIME type: the MIME lookup. The navigator support could either use the editor MIME lookup (over the Editors folder), or have it own MIME lookup over the current Navigator folder.
*** Bug 206587 has been marked as a duplicate of this bug. ***
*** Bug 206959 has been marked as a duplicate of this bug. ***
*** Bug 216982 has been marked as a duplicate of this bug. ***