electron: render menu items based on 'isEnabled'

This commit updates the logic of rendering menu items with the
electron target to be based on a command being `enabled`. Since
electron does not support graying-out items (enable), we must rely
on hiding these items from the menus since they are no-op when
executed.

Signed-off-by: vince-fugnitto <vincent.fugnitto@ericsson.com>

packages/core/src/electron-browser/menu/electron-main-menu-factory.ts

@@ -131,7 +131,9 @@ export class ElectronMainMenuFactory {
                     throw new Error(`Unknown command with ID: ${commandId}.`);
                 }
 
+                // We should omit rendering menu items which are not visible or enabled.
                 if (!this.commandRegistry.isVisible(commandId, ...args)
+                    || !this.commandRegistry.isEnabled(commandId, ...args)
                     || (!!node.action.when && !this.contextKeyService.match(node.action.when))) {
                     continue;
                 }