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I opened a testing project from issue 202569 and noticed that project's Source Format is red and says something about being invalid. So I opened Java Platform Manager (via Libraries Panel) and decided to added JDK 1.7. After pressing Finish in Add Java Platform wizard a dialog showed up telling me that "Incompatible Source Level Value 1.7. ..... Do you want to change Java Platform and update source level version?". I clicked Cancel but dialog keeps coming back and it looks like it cannot be closed any other way than "Change Platform". Either there should be just OK button and Cancel should be fixed.
Fixed jet-main 9be1635b176a
Integrated into 'main-golden' Changeset: http://hg.netbeans.org/main-golden/rev/9be1635b176a User: Tomas Zezula <tzezula@netbeans.org> Log: #203401:"Cancel" in Change Java Platform dialog does not work