On the welcome screen Check for Updates looked dead: its result goes only through a notification balloon, and with the updates group set to No popup, what Don't Show Again writes, it was muted, with no status bar or Notifications window to show it. The manual check and the install it offers now mark their notifications as user-initiated, so they appear regardless of balloon settings; the startup check and other notifications still follow them.
Refs #40
Co-authored-by: emanyzwww <[email protected]>