Custom attribute transformers model

plugins/org.jkiss.dbeaver.model/src/org/jkiss/dbeaver/model/virtual/DBVTransformSettings.java

@@ -86,7 +86,8 @@ public class DBVTransformSettings {
         }
         for (int i = 0; i < descriptors.size();) {
             final DBDAttributeTransformerDescriptor descriptor = descriptors.get(i);
-            if ((descriptor.isApplicableByDefault() && excludedTransformers != null && excludedTransformers.contains(descriptor.getId())) ||
+            if ((descriptor.isCustom() && !descriptor.getId().equals(customTransformer)) ||
+                (descriptor.isApplicableByDefault() && excludedTransformers != null && excludedTransformers.contains(descriptor.getId())) ||
                 (!descriptor.isApplicableByDefault() && includedTransformers != null && !includedTransformers.contains(descriptor.getId())))
             {
                 descriptors.remove(i);

plugins/org.jkiss.dbeaver.model/src/org/jkiss/dbeaver/model/virtual/DBVUtils.java

@@ -98,7 +98,7 @@ public abstract class DBVUtils {
         if (!filtered) {
             // Leave only default transformers
             for (int i = 0; i < tdList.size();) {
-                if (!tdList.get(i).isApplicableByDefault()) {
+                if (tdList.get(i).isCustom() || !tdList.get(i).isApplicableByDefault()) {
                     tdList.remove(i);
                 } else {
                     i++;