fix(viewport): Initial blank image on SR/SEG initial display (#3304)

* fix: Blank display area on initial DICOM SR load

* Docs

* Fix a NPE

extensions/cornerstone-dicom-sr/src/index.tsx

@@ -1,8 +1,11 @@
 import React from 'react';
 import getSopClassHandlerModule from './getSopClassHandlerModule';
+import getHangingProtocolModule, {
+  srProtocol,
+} from './getHangingProtocolModule';
 import onModeEnter from './onModeEnter';
-import commandsModule from './commandsModule';
-import init from './init';
+import getCommandsModule from './commandsModule';
+import preRegistration from './init';
 import { id } from './id.js';
 import toolNames from './tools/toolNames';
 import hydrateStructuredReport from './utils/hydrateStructuredReport';
@@ -31,9 +34,7 @@ const dicomSRExtension = {
   id,
   onModeEnter,
 
-  preRegistration({ servicesManager, configuration = {} }) {
-    init({ servicesManager, configuration });
-  },
+  preRegistration,
 
   /**
    *
@@ -54,14 +55,11 @@ const dicomSRExtension = {
 
     return [{ name: 'dicom-sr', component: ExtendedOHIFCornerstoneSRViewport }];
   },
-  getCommandsModule({ servicesManager, commandsManager, extensionManager }) {
-    return commandsModule({
-      servicesManager,
-      commandsManager,
-      extensionManager,
-    });
-  },
+  getCommandsModule,
   getSopClassHandlerModule,
+  getHangingProtocolModule,
+
+  // Include dynmically computed values such as toolNames not known till instantiation
   getUtilityModule({ servicesManager }) {
     return [
       {
@@ -75,4 +73,6 @@ const dicomSRExtension = {
 };
 
 export default dicomSRExtension;
-export { hydrateStructuredReport };
+
+// Put static exports here so they can be type checked
+export { hydrateStructuredReport, srProtocol };