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When is enabled the option "Generate Mnemonics Code" the NetBeans used the package org.openide.awt but this package isn't in the instalation.
The Mnemonics class is part of the org.openide.awt module. Form module should provide it as a separate library (limilarly to swinglayout) when the user enables "Mnemonics code generation" for a form outside of apisupport-project.
*** This issue has been marked as a duplicate of 70944 ***
I beleive that Form module should provide the Mnemonics class but it isn't. Would should have a libary with Mnemonics class for add in my project, shouldn't?
Yes, that's what issue 70944 is about. Originally, the use of Mnemonics class was intended only for forms designed for NetBeans platform. The class is not available in a suitable separate library now.