Extension guideline compliance

[jolampi]

Since January 2021 version of VS Code there are now official guidelines for extensions: https://code.visualstudio.com/api/references/extension-guidelines

• Notifications
  • Most of the notifications shown are as a result/feedback to user-initiated action.
  • Do not show options can only be added where applicable. Some actions directly respond to user.
  • Multiple notifications may be shown when notifying about new exercises.
  • "OK" buttons break the principle of no actions if there aren't any.
• Progress notification
  • Show details link to display logs - how?
  • See if there are any applicable cases for providing a cancel option.
  • Add Timeout handling.
• Views
  • Use (existing) icons with views.
  • View container shouldn't be used to open a webview. This might inherently be in conflict with the extension's usage principles.
• Webviews
  • Ensure that views follow accessibility guidance.
  • Shouldn't be opened with extension updates. Big updates like 2.0 may warrant one anyway.
  • Shouldn't be used to replace existing functionality such as welcome pages (?), settings (Use native settings menu #492 )
  • See if "onboarding" could be used to guide user with using the extension.
• Status bar
  • Barely used, should be simply removed.
• Quick picks
  • Seems to be OK. Guideline may give hints for decorations.
• Editor actions
  • Shouldn't use custom colors.
  • Shouldn't have more than one icon - current two seems more useful though.
  • Should use standard icons, but makes sense to have TMC icons in a TMC workspace.
  • Should be able to hide.
• Context menus
  • Should be fine but make sure.
• Settings
  • See Use native settings menu #492
• Command palette
  • Should be fine but make sure.