Keep the match list and the chart in step

taxonomy.py

@@ -504,13 +504,23 @@ def build_taxonomy_tab():
             return show(taxonomy.taxon_path(taxid) if taxid else DEFAULT_PATH)
 
         def taxonomy_best(text):
+            """Enter moves the chart, so it ticks the row it moved to as well.
+
+            Showing a lineage while the list it came from sits unselected reads
+            as two answers to the same question.
+            """
             choices = taxonomy.search(text)
-            return taxonomy_view(choices[0][1] if choices else None)
+            if not choices:
+                return (*taxonomy_view(None), gr.Radio(choices=[], value=None),
+                        "No matching eukaryotic taxa in this snapshot.")
+            taxid = choices[0][1]
+            return (*taxonomy_view(taxid), gr.Radio(choices=choices, value=taxid),
+                    f"{len(choices)} matches, closest first. Showing **{choices[0][0].split(' · ')[0]}**.")
 
         # No separate search button: the list follows what is typed, Enter takes
         # the closest match, and picking any row opens it.
         query.change(taxonomy_search, query, [matches, status], show_progress="hidden")
-        query.submit(taxonomy_best, query, [tree, route, open_database])
+        query.submit(taxonomy_best, query, [tree, route, open_database, matches, status])
         matches.input(taxonomy_view, matches, [tree, route, open_database])
     with gr.Accordion("About the tree and coverage", open=False, elem_classes="atlas-disclosure"):
         gr.Markdown("This tree follows **NCBI Taxonomy within Eukaryota**. Animals and fungi share the Opisthokonta branch; "