Make sure progress UI updates occur on main thread

src/ui/add_job.py

@@ -5,7 +5,7 @@ import socket
 import threading
 
 import psutil
-from PyQt6.QtCore import QThread, pyqtSignal, Qt
+from PyQt6.QtCore import QThread, pyqtSignal, Qt, pyqtSlot
 from PyQt6.QtWidgets import (
     QApplication, QWidget, QVBoxLayout, QHBoxLayout, QLabel, QLineEdit, QPushButton, QFileDialog, QSpinBox, QComboBox,
     QGroupBox, QCheckBox, QProgressBar, QPlainTextEdit, QDoubleSpinBox, QMessageBox, QListWidget, QListWidgetItem
@@ -402,14 +402,23 @@ class NewRenderJobForm(QWidget):
 
         # submit job in background thread
         self.worker_thread = SubmitWorker(window=self)
+        self.worker_thread.update_ui_signal.connect(self.update_submit_progress)
         self.worker_thread.message_signal.connect(self.after_job_submission)
         self.worker_thread.start()
 
+    @pyqtSlot(str, str)
+    def update_submit_progress(self, hostname, percent):
+        # Update the UI here. This slot will be executed in the main thread
+        self.submit_progress_label.setText(f"Transferring to {hostname} - {percent}%")
+        self.submit_progress.setMaximum(100)
+        self.submit_progress.setValue(int(percent))
+
 
 class SubmitWorker(QThread):
     """Worker class called to submit all the jobs to the server and update the UI accordingly"""
 
     message_signal = pyqtSignal(Response)
+    update_ui_signal = pyqtSignal(str, str)
 
     def __init__(self, window):
         super().__init__()
@@ -421,10 +430,7 @@ class SubmitWorker(QThread):
 
             def callback(monitor):
                 percent = f"{monitor.bytes_read / encoder_len * 100:.0f}"
-                self.window.submit_progress_label.setText(f"Transferring to {hostname} - {percent}%")
-                self.window.submit_progress.setMaximum(100)
-                self.window.submit_progress.setValue(int(percent))
-
+                self.update_ui_signal.emit(hostname, percent)
             return callback
 
         hostname = self.window.server_input.currentText()