vscode: add support for `debug/toolbar`, `debug/variables/context` menus contribution and `debugState` `when` clause context

[kittaakos]

Feature Description:

Add support for the following in Theia to improve the VS Code compatibility:

• debug/toolbar, (See Support "debug/toolBar" command icons #9389)
• debug/variables/context, and
• debugState when context.

---

Steps to reproduce:

• Check out the vscode-mock-debug--theia branch in my fork,
• Build and start Theia from the sources (make sure to run yarn download:plugins to make the mock debugger VS Code extension available before Theia start),
• Open the sampleWorkspace folder from Microsoft/vscode-mock-debug repo as a workspace in Theia,
• Open the Debug view and start Debug readme.md,

2022-11-16T15:08:02.683Z root WARN Failed to register a menu item for plugin kittaakos.mock-debug contributed to debug/toolBar {
  command: 'extension.mock-debug.sayHello',
  submenu: undefined,
  alt: undefined,
  group: 'navigation',
  when: "debugType == 'mock'"
} Error: Could not find submenu with id debug/toolBar
    at MenuModelRegistry.getMenuNode (file:///Users/a.kitta/dev/git/theia/examples/electron/lib/bundle.js:137499:23)
    at file:///Users/a.kitta/dev/git/theia/examples/electron/lib/packages_plugin-ext_lib_hosted_browser_hosted-plugin_js.js:6634:66
    at Array.forEach (<anonymous>)
    at MenusContributionPointHandler.handle (file:///Users/a.kitta/dev/git/theia/examples/electron/lib/packages_plugin-ext_lib_hosted_browser_hosted-plugin_js.js:6628:37)
    at file:///Users/a.kitta/dev/git/theia/examples/electron/lib/packages_plugin-ext_lib_hosted_browser_hosted-plugin_js.js:7350:71
    at pushContribution (file:///Users/a.kitta/dev/git/theia/examples/electron/lib/packages_plugin-ext_lib_hosted_browser_hosted-plugin_js.js:7245:32)
    at PluginContributionHandler.handleContributions (file:///Users/a.kitta/dev/git/theia/examples/electron/lib/packages_plugin-ext_lib_hosted_browser_hosted-plugin_js.js:7350:9)
    at HostedPluginSupport.loadContributions (file:///Users/a.kitta/dev/git/theia/examples/electron/lib/packages_plugin-ext_lib_hosted_browser_hosted-plugin_js.js:446:61)
    at HostedPluginSupport.doLoad (file:///Users/a.kitta/dev/git/theia/examples/electron/lib/packages_plugin-ext_lib_hosted_browser_hosted-plugin_js.js:358:42)
    at async ProgressService.withProgress (file:///Users/a.kitta/dev/git/theia/examples/electron/lib/bundle.js:140547:20)

2022-11-16T15:08:02.681Z root WARN Failed to register a menu item for plugin kittaakos.mock-debug contributed to debug/variables/context {
  command: 'extension.mock-debug.sayVariableContextMenu',
  submenu: undefined,
  alt: undefined,
  group: 'navigation',
  when: "inDebugMode && debugType == 'mock' && debugState == stopped"
} Error: Could not find submenu with id debug/variables/context
    at MenuModelRegistry.getMenuNode (file:///Users/a.kitta/dev/git/theia/examples/electron/lib/bundle.js:137499:23)
    at file:///Users/a.kitta/dev/git/theia/examples/electron/lib/packages_plugin-ext_lib_hosted_browser_hosted-plugin_js.js:6634:66
    at Array.forEach (<anonymous>)
    at MenusContributionPointHandler.handle (file:///Users/a.kitta/dev/git/theia/examples/electron/lib/packages_plugin-ext_lib_hosted_browser_hosted-plugin_js.js:6628:37)
    at file:///Users/a.kitta/dev/git/theia/examples/electron/lib/packages_plugin-ext_lib_hosted_browser_hosted-plugin_js.js:7350:71
    at pushContribution (file:///Users/a.kitta/dev/git/theia/examples/electron/lib/packages_plugin-ext_lib_hosted_browser_hosted-plugin_js.js:7245:32)
    at PluginContributionHandler.handleContributions (file:///Users/a.kitta/dev/git/theia/examples/electron/lib/packages_plugin-ext_lib_hosted_browser_hosted-plugin_js.js:7350:9)
    at HostedPluginSupport.loadContributions (file:///Users/a.kitta/dev/git/theia/examples/electron/lib/packages_plugin-ext_lib_hosted_browser_hosted-plugin_js.js:446:61)
    at HostedPluginSupport.doLoad (file:///Users/a.kitta/dev/git/theia/examples/electron/lib/packages_plugin-ext_lib_hosted_browser_hosted-plugin_js.js:358:42)
    at async ProgressService.withProgress (file:///Users/a.kitta/dev/git/theia/examples/electron/lib/bundle.js:140547:20)

---

Missing features:

1. The custom command is missing from the debug toolbar (debug/toolbar).
   

   

2. The context menu is unavailable for the Variables view (debug/variables/context).
   
   

3. The debugState when context is undefined. It should be one of the following: 'inactive', 'initializing', 'stopped', 'running'. To verify this, I have written a sample command to show the when context value for a key.

   • inDebugMode is supported, ✅
   • debugType is supported, ✅
   • debugState is undefined. ❌
     
     
     

[kittaakos]

I will take care of this issue.