Ask for confirmation when overwriting saved search

ftl/core/browsing.ftl

@@ -21,6 +21,7 @@ browsing-change-note-type2 = Change Note Type...
 browsing-change-to = Change { $val } to:
 browsing-clear-unused = Clear Unused
 browsing-clear-unused-tags = Clear Unused Tags
+browsing-confirm-saved-search-overwrite = A saved search with the name { $name } already exists. Do you want to overwrite it?
 browsing-confirm-saved-searches-deletion =
     { $count ->
         [one] Are you sure you want to delete the selected saved search?

qt/aqt/sidebar.py

@@ -1279,6 +1279,10 @@ class SidebarTreeView(QTreeView):
             filt = conf[old_name]
         except KeyError:
             return
+        if new_name in conf and not askUser(
+            tr(TR.BROWSING_CONFIRM_SAVED_SEARCH_OVERWRITE, name=new_name)
+        ):
+            return
         conf[new_name] = filt
         del conf[old_name]
         self._set_saved_searches(conf)
@@ -1294,11 +1298,15 @@ class SidebarTreeView(QTreeView):
             )
         except InvalidInput as e:
             show_invalid_search_error(e)
-        else:
+            return
         name = getOnlyText(tr(TR.BROWSING_PLEASE_GIVE_YOUR_FILTER_A_NAME))
         if not name:
             return
         conf = self._get_saved_searches()
+        if name in conf and not askUser(
+            tr(TR.BROWSING_CONFIRM_SAVED_SEARCH_OVERWRITE, name=name)
+        ):
+            return
         conf[name] = filt
         self._set_saved_searches(conf)
         self.refresh(