fix assembly-symmetry off option

- would not remove cage/axes visuals

docs/interesting-pdb-entries.md

@@ -29,3 +29,7 @@
 * Long linear sugar chain (4HG6)
 * Anisotropic B-factors/Ellipsoids (1EJG)
 * NOS bridges (LYS-CSO in 7B0L, 6ZWJ, 6ZWH)
+
+Assembly symmetries
+* 5M30 (Assembly 1, C3 local and pseudo)
+* 1RB8 (Assembly 1, I global)

src/extensions/rcsb/assembly-symmetry/prop.ts

@@ -124,16 +124,20 @@ export function getSymmetrySelectParam(structure?: Structure) {
     if (structure) {
         const assemblySymmetryData = AssemblySymmetryDataProvider.get(structure).value;
         if (assemblySymmetryData) {
-            const options: [number, string][] = [];
+            const options: [number, string][] = [
+                [-1, 'Off']
+            ];
             for (let i = 0, il = assemblySymmetryData.length; i < il; ++i) {
                 const { symbol, kind } = assemblySymmetryData[i];
                 if (symbol !== 'C1') {
                     options.push([ i, `${i + 1}: ${symbol} ${kind}` ]);
                 }
             }
-            if (options.length) {
+            if (options.length > 1) {
                 param.options = options;
-                param.defaultValue = options[0][0];
+                param.defaultValue = options[1][0];
+            } else {
+                options.length = 0;
             }
         }
     }

src/extensions/rcsb/assembly-symmetry/ui.tsx

@@ -73,7 +73,6 @@ export class AssemblySymmetryControls extends CollapsableControls<{}, AssemblySy
         const structure = this.pivot.cell.obj?.data;
         const params = PD.clone(structure ? AssemblySymmetryProvider.getParams(structure) : AssemblySymmetryProvider.defaultParams);
         params.serverUrl.isHidden = true;
-        params.symmetryIndex.options = [[-1, 'Off'], ...params.symmetryIndex.options];
         return params;
     }