[doc] Update the release notes

backend/services/syson-diagram-services/src/main/java/org/eclipse/syson/diagram/services/DiagramQueryViewService.java

@@ -22,6 +22,7 @@
 import org.eclipse.sirius.components.diagrams.Diagram;
 import org.eclipse.sirius.components.diagrams.Node;
 import org.eclipse.syson.sysml.Element;
+import org.eclipse.syson.sysml.Namespace;
 import org.eclipse.syson.sysml.SysmlPackage;
 import org.eclipse.syson.sysml.Type;
 import org.eclipse.syson.sysml.ViewDefinition;
@@ -59,7 +60,7 @@ public DiagramQueryViewService(IObjectSearchService objectSearchService, Diagram
      * @return {@code true} if the diagram can be created on the provided {@code element}
      */
     public boolean canCreateDiagram(Element element) {
-        return true;
+        return element instanceof Namespace;
     }
 
     /**
@@ -72,7 +73,7 @@ public boolean isView(Element element, String viewDefinition, List<Object> ances
             var types = viewUsage.getType();
             if ((types == null || types.isEmpty()) && Objects.equals(StandardDiagramsConstants.GV_QN, viewDefinition)) {
                 isView = true;
-            } else {
+            } else if (types != null) {
                 var expectedViewDefinition = this.elementUtil.findByNameAndType(viewUsage, viewDefinition, ViewDefinition.class);
                 Type type = types.get(0);
                 isView = Objects.equals(type, expectedViewDefinition);
@@ -96,7 +97,7 @@ public boolean isView(Element element, String viewDefinition, Node selectedNode,
             var types = viewUsage.getType();
             if ((types == null || types.isEmpty()) && Objects.equals(StandardDiagramsConstants.GV_QN, viewDefinition)) {
                 isView = true;
-            } else {
+            } else if (types != null) {
                 var expectedViewDefinition = this.elementUtil.findByNameAndType(viewUsage, viewDefinition, ViewDefinition.class);
                 Type type = types.get(0);
                 isView = Objects.equals(type, expectedViewDefinition);

doc/content/modules/user-manual/pages/release-notes/2026.9.0.adoc

@@ -96,9 +96,6 @@ image::release-notes-action-inherited-item-border-nodes.png[ItemUsage border nod
 +
 image::release-notes-port-inherited-item-border-nodes.png[ItemUsage border node inheritance on PortDefinition and PortUsage, width=80%,height=80%]
 
-** Improve the edge tool creating a `FlowUsage`, by creating a `ReferenceUsage` used for the redefinition of the `FlowEnd` only when it is needed.
-** Fix the edge tool creating a `ConnectionUsage` between an `ActionUsage` graphical node and the _done_ `ActionUsage` graphical node.
-
 == Bug fixes
 
 * In diagrams:
@@ -115,8 +112,9 @@ The affected connections were missing their source and target and were therefore
 ** Fix an issue that prevented a nested `AttributeUsage` from becoming visible when it was first dropped from the _Explorer_ onto a _General View_ diagram.
 ** Fix `Comment` graphical nodes so changing their background color no longer changes their border color.
 ** Rename the _New Perform action_ tool to _New Perform Action_ for consistency with other tools.
-** Do not propose the the _New Subclassification_ edge tool from `EnumerationDefinition` graphical nodes' palette, which cannot subclassify another `EnumerationDefinition`.
+** Do not propose the _New Subclassification_ edge tool from `EnumerationDefinition` graphical nodes' palette, which cannot subclassify another `EnumerationDefinition`.
 ** Do not propose the _New Subclassification_ edge tool in the palette when targeting a `Usage` graphical node from a `Definition` graphical node.
+** Fix the edge tool creating a `ConnectionUsage` between an `ActionUsage` graphical node and the _done_ `ActionUsage` graphical node.
 
 * In all views:
 
@@ -128,8 +126,7 @@ The affected connections were missing their source and target and were therefore
 ** Fix the export of the keywords carried by the ends of a connection, such as the `#original` and `#derive` of a `Requirement` derivation, which were missing from the exported text when the connection had been created from a diagram.
 Exporting such a connection and importing it back no longer loses which end is which.
 ** Fix the import of `TransitionUsage` using _start_ which now set the source to the `StateUsage` _start_ from the standard library instead of `ActionUsage` _start_ from the standard library.
-
-** Fix the export of a documentation, a comment or a textual representation whose text contains `*/`.
+** Fix the export of a documentation, a comment or a textual representation whose text contains `\*/`.
 That sequence closes a comment in the SysML v2 textual notation, so the exported file could no longer be read.
 It is now exported as `* /`, and a warning reports it, since the exported text is then not exactly the one that was written.
 ** Preserve cross-document references when a SysML document is uploaded with a directory in its filename.
@@ -149,12 +146,11 @@ image::release-notes-show-hide-section-group-palette.png[New Show/Hide section i
 
 ** In standard diagrams, the group palette now provides _Delete from diagram_ when multiple graphical nodes are selected.
 It removes all selected nodes from the diagram without deleting the corresponding model elements.
-
 ** Selection dialog trees now apply the default _Explorer_ filters, hiding `Memberships`, root `Namespaces`, expose elements, and expression internals.
 It allows to focus on the elements that are relevant for the current model, while still allowing to select library elements.
-
 ** Direct edit no longer parses or modifies expressions.
 Use the dedicated expression tools to create or modify expressions, while direct edit remains focused on labels and feature syntax.
+** Improve the edge tool creating a `FlowUsage`, by creating a `ReferenceUsage` used for the redefinition of the `FlowEnd` only when it is needed.
 
 * In _Details_ view: