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Steps to reproduce: 1) Open NB Platforms dialog 2) Click to add new platform 3) Select correct NetBeans platform in FileChooser 4) Click the next button 5) set the Platfrom name field to "nb" 7) click to finish 8) Click to add new platform 9) Select correct NetBeans platform in FileChooser 10) Click the next button 11) set the Platfrom name field to "nb" 12) click to finish The new platform was not added to NBP manager because there already exists platfrom with the same name. Disable the Finish button on this state and show warning messsage in wizard.
fixed in #61196
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