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If running with EMFT without the presence of GMF, the validation preference page produces an error in the error log because the containing preference category does not exist. The containing category is defined in the org.eclipse.gmf.runtime.emf.ui of GMF and labelled "Modeling." This preference page needs to be placed into a valid category or renamed and placed into the root preference category.
I propose that the "Validation" category be moved to the root and renamed to "Modeling Validation". This would ensure that the category remains beside the "Modeling" category and can be easily found if one were looking in the current location.
Created attachment 32146 [details] patch for org.eclipse.emf.validation.ui
After looking further into the issue. There are two pref pages under the Modeling category: Validation and the sub category Constraints. The Validation page is used for Live Validation prefs and is defined in GMF, while the Constraints page is defined in EMFT. Because live validation is a GMF feature, the Validation page can be left alone. The Constraints page has been moved to the root and renamed to Validation Constraints.
Reviewed and applied patch
Move to verified as per bug 206558.