Show the notice that a transcript was saved under another name in the window too, not only in the log file

noScribe/main.py

@@ -2116,7 +2116,8 @@ def _append_log_text(self, txt, tags, link, tb, where):
                 self.log_textbox.delete("1.0", f"1.0 + {self.log_len - 3000} chars")
                 self.log_len = 3000
             if link:
-                tags = tags + self.hyperlink.add(partial(self.openLink, link))
+                # A single tag comes as a string ('error'), several as a list.
+                tags = ([tags] if isinstance(tags, str) else tags) + self.hyperlink.add(partial(self.openLink, link))
             self.log_textbox.insert(tk.END, txt, tags)
             self.log_textbox.yview_moveto(1)
             self.log_len += len(txt)

tests/test_log_link.py

@@ -0,0 +1,57 @@
+"""A log line with a link and a single tag given as a string.
+
+`logn(t('rescue_saving', ...), 'error', link=...)` -- the notice that the
+transcript could not be written under its name and was saved under another --
+failed in the window: `'error' + ['hyper', 'hyper-0']` raised a TypeError, which
+_append_log_text caught and wrote to the log file instead. So the only notice of
+where a failed job's partial transcript went never appeared on screen.
+"""
+import queue
+import threading
+
+import pytest
+
+pytest.importorskip("tkinter")
+
+from noScribe.main import App
+
+
+class _Textbox:
+    def __init__(self):
+        self.inserted = []
+
+    def winfo_exists(self):
+        return True
+
+    def configure(self, **kwargs):
+        pass
+
+    def insert(self, index, txt, tags=None):
+        self.inserted.append((txt, tags))
+
+    def yview_moveto(self, fraction):
+        pass
+
+
+class _Hyperlinks:
+    def add(self, action):
+        return ["hyper", "hyper-0"]
+
+
+@pytest.mark.parametrize("tags", ["error", ["error"]])
+def test_link_with_a_tag_reaches_the_window(tags):
+    app = object.__new__(App)
+    app._headless = False
+    app._shutting_down = False
+    app._ui_thread_id = threading.get_ident()
+    app._ui_tasks = queue.Queue()
+    app.log_file = None
+    app.log_len = 0
+    app.log_textbox = _Textbox()
+    app.hyperlink = _Hyperlinks()
+
+    app.log("Saved as transcript (1).html\n", tags, link="file://transcript (1).html")
+
+    assert app.log_textbox.inserted == [
+        ("Saved as transcript (1).html\n", ["error", "hyper", "hyper-0"])
+    ]