hint "Use @NbBundle.Messages" bad edit of Bundle.properties

./apisupport/apisupport.refactoring/src/org/netbeans/modules
/apisupport/hints/UseNbBundleMessages.java:
"UseNbBundleMessages.displayName=Use @NbBundle.Messages"

To reproduce:

1. in Menu > Tools > Options > Editor > Hints > NetBeansDevelopment
   enable "Use @NbBundle.Messages" hint
2. unzip sources; open OptionsPlayHack in IDE
3. open file OptionsPlayHackOptionsPanelController.java
4. go to the line:

           categoryName = "#OptionsCategory_Name_OptionsPlayHack",
   

   and accept the hint "Use NbBundle.Message"

1. the line

           keywords = "#OptionsCategory_Keywords_OptionsPlayHack",
   

   is marked in error. Hover mouse over this line and see

           Save modifications to Bundle.properties before using this hint
   

1. click on the save button

Observe:

• the line is still in error, but now

          No key 'OptionsCategory_Keywords_OptionsPlayHack'
              found in OptionsPlayHack.Bundle
          Bundle.properties does not contain any key 
              'OptionsCategory_Keywords_OptionsPlayHack'
  

• Open the bundle file and note that the remaining line is

          ptionsCategory_Keywords_OptionsPlayHack=keyw1
  

  which is a misspelling, missing initial "O"

• click undo button twice, see the correct spelling (and deleted line)