Don't show delete button for primary file

spiffworkflow-frontend/src/components/ReactDiagramEditor.tsx

@@ -68,6 +68,7 @@ type OwnProps = {
   completedTasksBpmnIds?: string[] | null;
   saveDiagram?: (..._args: any[]) => any;
   onDeleteFile?: (..._args: any[]) => any;
+  isPrimaryFile?: boolean;
   onSetPrimaryFile?: (..._args: any[]) => any;
   diagramXML?: string | null;
   fileName?: string;
@@ -92,6 +93,7 @@ export default function ReactDiagramEditor({
   completedTasksBpmnIds,
   saveDiagram,
   onDeleteFile,
+  isPrimaryFile,
   onSetPrimaryFile,
   diagramXML,
   fileName,
@@ -549,7 +551,7 @@ export default function ReactDiagramEditor({
             a={targetUris.processModelFileShowPath}
             ability={ability}
           >
-            {fileName && (
+            {fileName && !isPrimaryFile && (
               <ButtonWithConfirmation
                 description={`Delete file ${fileName}?`}
                 onConfirmation={handleDelete}

spiffworkflow-frontend/src/routes/ProcessModelEditDiagram.tsx

@@ -819,6 +819,7 @@ export default function ProcessModelEditDiagram() {
         processModelId={params.process_model_id || ''}
         saveDiagram={saveDiagram}
         onDeleteFile={onDeleteFile}
+        isPrimaryFile={params.file_name === processModel?.primary_file_name}
         onSetPrimaryFile={onSetPrimaryFileCallback}
         diagramXML={bpmnXmlForDiagramRendering}
         fileName={params.file_name}

spiffworkflow-frontend/src/routes/ProcessModelShow.tsx

@@ -264,6 +264,7 @@ export default function ProcessModelShow() {
       </Can>
     );
 
+    if (!isPrimaryBpmnFile) {
       elements.push(
         <Can
           I="DELETE"
@@ -283,6 +284,7 @@ export default function ProcessModelShow() {
           />
         </Can>
       );
+    }
     if (processModelFile.name.match(/\.bpmn$/) && !isPrimaryBpmnFile) {
       elements.push(
         <Can I="PUT" a={targetUris.processModelShowPath} ability={ability}>