[1091] Fix qualified names in FeatureReferenceExpression export

Bug: #1091
Signed-off-by: Gwendal Daniel <gwendal.daniel@obeosoft.com>
Signed-off-by: Arthur Daussy <arthur.daussy@obeo.fr>

Author: gdaniel

CHANGELOG.adoc

@@ -20,6 +20,8 @@
 - https://github.com/eclipse-syson/syson/issues/870[#870] [metamodel] Fix an issue while computing the name of `VariantMembership`. 
 - https://github.com/eclipse-syson/syson/issues/1083[#1083] [metamodel] Fix an issue where resolving against "unrestricted" name did not work
 - https://github.com/eclipse-syson/syson/issues/1075[#1075] [import] Fix a ClassCastException thrown while importing a model with a name conflict.
+- https://github.com/eclipse-syson/syson/issues/1091[#1091] [export] Fix `FeatureReferenceExpression` export for elements that should be exported as qualified names.
+Exporting a SysML model containing a `FeatureReferenceExpression` now correctly procudes qualified names where it should.
 
 === Improvements
 

backend/application/syson-application/src/test/java/org/eclipse/syson/application/export/ImportExportTests.java

@@ -477,4 +477,20 @@ public void checkOccurrenceTest() throws IOException {
 
         this.checker.check(input, expected);
     }
+
+    @Test
+    @DisplayName("Given a model with a FeatureReferenceExpression set with a qualified name, when importing and exporting the model, then the exported text file should be the same as the imported one.")
+    public void checkFeatureReferenceExpressionWithQualifiedNameDeresolution() throws IOException {
+        var input = """
+                package P1 {
+                    part p1;
+                }
+                package P2 {
+                    part part2 {
+                        part p = P1::p1;
+                    }
+                }""";
+
+        this.checker.check(input, input);
+    }
 }

backend/application/syson-sysml-export/src/main/java/org/eclipse/syson/sysml/export/SysMLElementSerializer.java

@@ -575,7 +575,7 @@ public String caseFeatureReferenceExpression(FeatureReferenceExpression expressi
         if (membership instanceof FeatureMembership feature && feature.getOwnedMemberFeature() instanceof Expression exp) {
             this.reportConsumer.accept(Status.warning("BodyExpression are not handled yet ({0})", exp.getElementId()));
         } else {
-            this.appendFeatureReferenceMember(builder, membership);
+            this.appendFeatureReferenceMember(builder, membership, expression);
         }
         return builder.toString();
     }
@@ -1316,9 +1316,9 @@ private void appendSequenceExpressionList(Appender builder, Expression expressio
         }
     }
 
-    private void appendFeatureReferenceMember(Appender builder, Membership membership) {
+    private void appendFeatureReferenceMember(Appender builder, Membership membership, Expression context) {
         if (membership.getMemberElement() instanceof Feature feature) {
-            builder.appendSpaceIfNeeded().append(this.getDeresolvableName(feature, membership));
+            builder.appendSpaceIfNeeded().append(this.getDeresolvableName(feature, context));
         }
     }
 

doc/content/modules/user-manual/pages/release-notes/2025.4.0.adoc

@@ -21,6 +21,7 @@ package p1 {
 }
 ```
 - Fix a problem encountered during the import of a SysML textual file in a specific model configuration. The model incorrectly resolved the target of a `Redefinition` when a name conflict was detected.
+- Fix an issue that prevented the export functionality to correctly produce qualified name for elements referenced in `FeatureReferenceExpression`.
 
 == New features