crash beim speichern und beenden (themen-Auswahl) behoben

ui/layout.py

@@ -58,14 +58,19 @@ class Layout:
             "size_mm": (60.0, 8.0),
             "format": "Format_1",
         },
+        "textfeld": {
+            "id": "Textfeld",
+            "size_mm": (60.0, 8.0),
+            "format": "Format_1",
+        },
     }
 
     _QUELLENANGABE_TEXT = (
         "Quelle Geobasisdaten: GeoSN, "
-        "<a href=\"https://www.govdata.de/dl-de/by-2-0\">dl-de/by-2-0</a><br><br>"
+        "<a href=\"https://www.govdata.de/dl-de/by-2-0\">dl-de/by-2-0</a><br>"
         "Quelle Fachdaten: Darstellung auf der Grundlage von Daten und mit Erlaubnis des "
-        "Sächsischen Landesamtes für Umwelt, Landwirtschaft und Geologie<br><br>"
-        "Basemap:<br><br>"
+        "Sächsischen Landesamtes für Umwelt, Landwirtschaft und Geologie<br>"
+        "Basemap:"
         "© GeoBasis-DE / <a href=\"https://www.bkg.bund.de\">BKG</a> ([%year($now)%]) "
         "<a href=\"https://creativecommons.org/licences/by/4.0/\">CC BY 4.0</a> "
         "mit teilweise angepasster Signatur<br>"

ui/tab_b_ui.py

@@ -335,17 +335,22 @@ class TabB(QWidget):
     def _disconnect_theme_collection_signals(self) -> None:
         """Trennt Signale der alten Theme-Collection sauber."""
         collection = self._connected_theme_collection
-        if collection is None:
-            return
-        for signal_name in ("mapThemesChanged", "changed", "themeChanged"):
-            signal = getattr(collection, signal_name, None)
-            if signal is None:
-                continue
-            try:
-                signal.disconnect(self._refresh_thema_combo_live)
-            except Exception:
-                pass
+        if collection is not None:
+            for signal_name in ("mapThemesChanged", "changed", "themeChanged"):
+                try:
+                    signal = getattr(collection, signal_name, None)
+                except RuntimeError:
+                    break
+                except Exception:
+                    continue
+                if signal is None:
+                    continue
+                try:
+                    signal.disconnect(self._refresh_thema_combo_live)
+                except Exception:
+                    pass
         self._connected_theme_collection = None
+        self._theme_signal_connected = False
 
     def _connect_theme_collection_signals(self) -> None:
         """Verbindet Signale der Theme-Collection für Live-Aktualisierung der Themenliste."""