"setContext" Command Does Not Work

[TomHermanSAP]

Bug Description:

A command should be exposed in the command palette based on a custom variable set with setContext.

Although I set the value of the custom variable to true, the command is not available from the command palette.

Important Observation:

• Since 6636-custom-editor: support for CustomEditor API #8910 the problem exists (and still exists in branch master of Theia).
• I verified that the above scenario works as expected in:
  • b972e2b
• But in the following commit it does not work anymore:
  • 5547c25

Attached is an example of a "Hello World" extension (Change its suffix from zip to vsix):
helloworld-sample-set-context-0.0.1.zip

The command Hello World is not available in the command palette .

package.json:

    "contributes": {
        "commands": [
            {
                "command": "extension.helloWorld",
                "title": "Hello World"
            }
        ],
        "menus": {
            "commandPalette": [
                {
                    "when": "tom",
                    "command": "extension.helloWorld"
                }
            ]
        }
    }

extension.ts:

import * as vscode from 'vscode';

export async function activate(context: vscode.ExtensionContext) {
	await vscode.commands.executeCommand("setContext", "tom", true);

	const disposable = vscode.commands.registerCommand('extension.helloWorld', () => {
		vscode.window.showInformationMessage('Hello World!');
	});
	context.subscriptions.push(disposable);
}

Steps to Reproduce:

1. git clone Theia's repository.
2. Download the .vsix file attached and copy it into the plugins directory under Theia's repository.
3. In Terminal of root directory of Theia's repository: yarn; yarn start:browser.
4. Open localhost:3000 in browser.
5. Try to find the command Hello World in the command palette.
6. The command Hello World is not available from the command palette.(!)

Additional Information

• Operating System: Windows 10
• Theia Version: master.