allow exiting application using ctrl + c (signal sigint)

for easier debugging

usr/bin/setup-wizard-dist

@@ -5,7 +5,4 @@
 ## See the file COPYING for copying conditions.
 
 from setup_wizard_dist import setup_wizard_dist
-import signal
-signal.signal(signal.SIGINT, signal.SIG_DFL)
-
 setup_wizard_dist.main()

usr/lib/python3/dist-packages/setup_wizard_dist/setup_wizard_dist.py

@@ -13,6 +13,7 @@
 import os, yaml
 import inspect
 import sys
+import signal
 import pathlib
 
 from guimessages.translations import _translations
@@ -21,6 +22,11 @@
 import shutil
 
 
+def sigint_handler(*args):
+    """Handler for the SIGINT signal."""
+    QtWidgets.QApplication.quit()
+
+
 def power_off_system():
     print('WARNING: legal not accepted. Shutdown initiated.')
     if os.path.exists('/etc/dev'):
@@ -312,6 +318,14 @@ def main():
 
    app = QtWidgets.QApplication(sys.argv)
 
+   # Bind the CTRL+C signal
+   signal.signal(signal.SIGINT, sigint_handler)
+
+   # Ensure the application will be responsive to the SIGINT signal (CTRL+C)
+   timer = QTimer()
+   timer.timeout.connect(lambda: None)
+   timer.start(500)
+
    # when there is no page need showing, we simply do not start GUI to
    # avoid an empty page
    if len(Common.wizard_steps) == 0: