Fix an issue with progress accepting for PySide6

I don't know why this is an issue, but these changes appear to fix it.

Signed-off-by: Patrick Avery <[email protected]>

hexrd/ui/indexing/run.py

@@ -48,7 +48,8 @@ def __init__(self, parent=None):
 
     def setup_connections(self):
         self.progress_text.connect(self.progress_dialog.setLabelText)
-        self.accept_progress_signal.connect(self.progress_dialog.accept)
+        self.accept_progress_signal.connect(self.progress_dialog.accept,
+                                            Qt.QueuedConnection)
 
     def update_progress_text(self, text):
         self.progress_text.emit(text)
@@ -387,6 +388,8 @@ def generate_grains_table(self):
             self.grains_table)
 
     def confirm_indexing_results(self):
+        # FIXME: why is accepting the progress necessary here?
+        self.accept_progress()
         if self.grains_table is None:
             msg = 'No grains found'
             QMessageBox.critical(self.parent, msg, msg)