Make the new folding default (#2150)

- make new extended folding option default
- change preferences messages so the option is no longer marked as experimental

Author: jakub-suliga

org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/folding/FoldingMessages.properties

@@ -27,8 +27,8 @@ DefaultJavaFoldingPreferenceBlock_customRegionStart=Region start comment text
 defaultJavaFoldingPreferenceBlock_customRegionEnd=Region end comment text
 
 DefaultJavaFoldingPreferenceBlock_New = &Activate feature
-DefaultJavaFoldingPreferenceBlock_New_Setting_Title = &Extended folding (Experimental)
+DefaultJavaFoldingPreferenceBlock_New_Setting_Title = &Extended folding
 JavaFoldingStructureProviderRegistry_warning_providerNotFound_resetToDefault= The ''{0}'' folding provider could not be found. Resetting to the default folding provider.
-DefaultJavaFoldingPreferenceBlock_Warning_New_Feature= &Enable folding for other code blocks. Activating this feature may cause a significant performance degradation.
+DefaultJavaFoldingPreferenceBlock_Warning_New_Feature= &Enable folding for other code blocks.
 
 EmptyJavaFoldingPreferenceBlock_emptyCaption=

org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/PreferenceConstants.java

@@ -4453,7 +4453,7 @@ public static void initializeDefaultValues(IPreferenceStore store) {
 		store.setDefault(EDITOR_JAVA_CODEMINING_DEFAULT_FILTER_FOR_PARAMETER_NAMES, true);
 		store.setDefault(EDITOR_JAVA_CODEMINING_SHOW_PARAMETER_NAME_SINGLE_ARG, true);
 
-		store.setDefault(EDITOR_NEW_FOLDING_ENABLED, false);
+		store.setDefault(EDITOR_NEW_FOLDING_ENABLED, true);
 
 		// Javadoc hover & view
 		JavaElementLinks.initDefaultPreferences(store);