import .apkg files in a background thread

qt/aqt/importing.py

@@ -395,11 +395,11 @@ def importFile(mw, file):
 
         # importing non-colpkg files
         mw.progress.start(immediate=True)
-        try:
-            try:
-                importer.run()
-            finally:
+
+        def on_done(future: Future):
             mw.progress.finish()
+            try:
+                future.result()
             except zipfile.BadZipfile:
                 showWarning(invalidZipMsg())
             except Exception as e:
@@ -429,8 +429,11 @@ Unable to import from a read-only file."""
                     tooltip(log)
                 else:
                     showText(log)
+
             mw.reset()
 
+        mw.taskman.run_in_background(importer.run, on_done)
+
 
 def invalidZipMsg():
     return _(