triggerEvent() set ignoreUpdate to true at the start but three early
return paths skipped the reset at the end. Once any of these paths was
hit, the TLS flag stayed true permanently, blocking all piston neighbor
updates for the rest of the server session.
Previously paste only worked in the chat screen. Wire Screen::getClipboard() into the two remaining text input paths so Ctrl+V works for sign editing, seed entry, server IP/port, and world name fields.
Revela