Merge pull request #1609 from Ultimaker/bugfix_CURA-3604

CURA-3604 Fix batched gcode compression for "print over network"

plugins/UM3NetworkPrinting/NetworkPrinterOutputDevice.py

@@ -795,6 +795,13 @@ class NetworkPrinterOutputDevice(PrinterOutputDevice):
 
             byte_array_file_data = b""
             batched_line = ""
+
+            def _compress_data_and_notify_qt(file_data, data_to_append):
+                file_data += gzip.compress(data_to_append.encode("utf-8"))
+                QCoreApplication.processEvents()  # Ensure that the GUI does not freeze.
+                # Pretend that this is a response, as zipping might take a bit of time.
+                self._last_response_time = time()
+
             for line in self._gcode:
                 if not self._compressing_print:
                     self._progress_message.hide()
@@ -807,14 +814,16 @@ class NetworkPrinterOutputDevice(PrinterOutputDevice):
                     continue
 
                 if self._use_gzip:
-                    byte_array_file_data += gzip.compress(batched_line.encode("utf-8"))
+                    _compress_data_and_notify_qt(byte_array_file_data, batched_line)
                     batched_line = ""
-                    QCoreApplication.processEvents()  # Ensure that the GUI does not freeze.
-                    # Pretend that this is a response, as zipping might take a bit of time.
-                    self._last_response_time = time()
                 else:
                     byte_array_file_data += line.encode("utf-8")
 
+            # don't miss the last batch if it's there
+            if self._use_gzip:
+                if batched_line:
+                    _compress_data_and_notify_qt(byte_array_file_data, batched_line)
+
             if self._use_gzip:
                 file_name = "%s.gcode.gz" % Application.getInstance().getPrintInformation().jobName
             else: