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Go to Options->Miscellaneous->Files Change Ingnored Files Pattern. The project view is not refreshed to reflect the change.
As a workaround is close the project and open again.
Fixed: http://hg.netbeans.org/main/rev/f13bfdfaff3a
Integrated into 'main-golden', available in NB_Trunk_Production #324 build Changeset: http://hg.netbeans.org/main/rev/f13bfdfaff3a User: Radek Matous <rmatous@netbeans.org> Log: #139582 Project view is not refreshed after changing Ingnored Files Pattern