Add Ctrl+Q and ask before quitting with an unsaved upscale

Quit and window close share closeEvent, so both ask. The unsaved check
moves into discard_ok, used by Clear as well.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/test_upscale_qt.py b/test_upscale_qt.py
index 66423e8..7175e92 100644
--- a/test_upscale_qt.py
+++ b/test_upscale_qt.py
@@ -114,6 +114,25 @@ def test_main_window():
     assert not w.a_clear.isEnabled() and not w.a_up.isEnabled()
 
 
+def test_quit_asks_when_unsaved():
+    from PyQt6.QtWidgets import QMessageBox
+    w = uq.Main()
+    assert w.a_quit.shortcut().toString() == 'Ctrl+Q'
+    path = os.path.join(TMP, 'q.png')
+    QImage(4, 4, QImage.Format.Format_RGB32).save(path)
+    w.load(path)
+    w.jobs[0].result = QImage(16, 16, QImage.Format.Format_RGB32)
+    answers = []
+    real = QMessageBox.question
+    try:
+        QMessageBox.question = lambda *a: answers.append(a) or QMessageBox.StandardButton.No
+        assert not w.close() and len(answers) == 1      # declined, stays open
+        w.jobs[0].saved = True
+        assert w.close() and len(answers) == 1          # saved, no question
+    finally:
+        QMessageBox.question = real
+
+
 if __name__ == '__main__':
     for name, fn in list(globals().items()):
         if name.startswith('test_'):