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If user renames diagram and has used incorrect symbols, information message dialog will appear. Already typed name will be loosed. And user will have to type it again. steps: - try to rename existing diagram using 'rename' commant from context menu. - type new name with '&' sign. Information message will appear. 'OK' will close 'Information' dialog. But renaming dialog will not be opened again. The only place where it works as expected is New diagram creation dialog. User gets information message with 'Finish' button disabling. But it is possible to edit typed name.
The same for renaming in tree with 'F2' key. And in properties (It is the only place where popup dialog may be expected. At least if it is not possible to set property value back to edit mode with typed new name).
see also issue 99713 - diagram name typed in save as is loosed after message about incorrect symbols
Sorry, I really don't see it as an issue at all. It's a common behavior on other applications, look at Windows folder rename. This should be acceptable for simple action that does not require any other data input.
This issue is an issue about with the rename dialog that appears when using the rename context menu. The OK button should not be enabled if the name is not a valid name.
same as issue 99713, minor usability issue, according to guideline http://qa.netbeans.org/bugzilla/bug_priority_guidelines.html, it should be p4. The fix would be to implement custom dialog to take input name.