Default version of IPyWidgets to 8 (#16926)

Author: DonJayamanne

src/kernels/kernel.ts

@@ -884,14 +884,11 @@ abstract class BaseKernel implements IBaseKernel {
     }
     /**
      * Determines the version of IPyWidgets used in the kernel
-     * For non-python kernels, we assume the version of IPyWidgets is 7.
+     * For non-python kernels, we assume the version of IPyWidgets is 8.
      * For Python we just run a block of Python code to determine the version.
      */
     private async determineVersionOfIPyWidgets(session: IKernelSession) {
         if (!isPythonKernelConnection(this.kernelConnectionMetadata)) {
-            // For all other kernels, assume we are using the older version of IPyWidgets.
-            // There are very few kernels that support IPyWidgets, however IPyWidgets 8 is very new
-            // & it is unlikely that others have supported this new version.
             this._ipywidgetsVersion = WIDGET_VERSION_NON_PYTHON_KERNELS;
             this._onIPyWidgetVersionResolved.fire(WIDGET_VERSION_NON_PYTHON_KERNELS);
             return;

src/notebooks/controllers/ipywidgets/message/commonMessageCoordinator.ts

@@ -155,7 +155,7 @@ export class CommonMessageCoordinator {
                             );
                         }
                     } else {
-                        // For non-python kernels, always assume version 7.
+                        // For non-python kernels, always assume version 8.
                         if (!deferred.completed) {
                             deferred.resolve(WIDGET_VERSION_NON_PYTHON_KERNELS);
                         }

src/platform/common/constants.ts

@@ -494,7 +494,7 @@ export const defaultNotebookFormat = { major: 4, minor: 2 };
 
 export const WIDGET_MIMETYPE = 'application/vnd.jupyter.widget-view+json';
 export const WIDGET_STATE_MIMETYPE = 'application/vnd.jupyter.widget-state+json';
-export const WIDGET_VERSION_NON_PYTHON_KERNELS = 7;
+export const WIDGET_VERSION_NON_PYTHON_KERNELS = 8;
 
 /**
  * Used as a fallback when determinining the extension id that calls into the Jupyter extension API fails.