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The problem can be demonstrated e.g. when doing Refactoring->Change Method Parameters->Add and jump to parameter name and press Shift+Home and press Delete. The delete removes till offset==0 while it should only remove till starting offset of the DocumentView.
*** Bug 241352 has been marked as a duplicate of this bug. ***
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