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It allows you to ignore tested IDE easier.
I think xtest was meant here.
I would propose to raise priority. I find in practice that when running tests frequently, it takes ages and I want to do other work, but Editor windows keep on popping up in my face etc. This ought to be easy to fix, I think (just a system property hopefully?).
Fixed, added -J-Dnetbeans.windows=mdi to cmd line.
Was fixed for modules: java, openide, openidex, core
It would be better to have a chance to define additional netbeans command-line parameters as some property in build.xml (e.g. netbeans.commandline) and add this property to args.
Another good candidate: whatever flag turns off display of the splash screen.
-nosplash added to IDE cmd line, so no splash is shown. To second issue: windows mode can be overriden by setting property xtest.ide.winsys. Default value is 'mdi'. Other value is 'sdi'.