respondClipboardLoad method
Answer a pending OSC 52 paste request with text (host reads the system
clipboard, then calls this). Encoded reply goes out on output.
Implementation
void respondClipboardLoad(String text) {
// A load reply can only answer an OSC 52 query the program already emitted,
// which means the engine has produced output and is therefore bound. Before
// any binding there is no pending request to satisfy — nothing to do.
if (_client == null) return;
_binding!.respondClipboardLoad(text);
_client!.pumpEventsNow();
}