Using CHANNEL_PRINTS to transfer printbuffers to stdout is now working.

luprex/cpp/core/printbuffer.cpp

@@ -179,6 +179,13 @@ void PrintBuffer::patch(StreamBuffer *sb, DebugCollector *dbc) {
     }
 }
 
+bool PrintChanneler::have_prints(const PrintBuffer *printbuffer) const
+{
+    return ((printbuffer != nullptr) &&
+            (printbuffer->first_line() < printbuffer->first_unchecked()) &&
+            (line_ < printbuffer->first_unchecked()));
+}
+
 bool PrintChanneler::channel(const PrintBuffer *printbuffer, StreamBuffer *sb) {
     if (printbuffer == nullptr) return false;
     if (printbuffer->first_line() > line_) {