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When a file is opened in the externaleditor various commands are sent from the exted to the editor. The getLength function is sent before any data is inserted into the buffer so it always returns 0. I don't see this causing any problems but its something which potentially could.
This bug was reported against NetBeans IDE 6.0 or an older release, or against a non-maintained module. NetBeans team does not have enough resources to get to this issue, therefore we are closing the issue as a WONTFIX. If you are interested in providing a patch for this bug, please see our NetFIX guidelines for how to proceed. We apologize for any inconvenience. Thank you. The NetBeans Team