More fixes

layer_manager.py

@@ -36,12 +36,26 @@ class LocationLayerManager:
     # ------------------------------------------------------------------
 
     def create_layer(self) -> None:
-        """Create the memory layer, add it to the project and load initial features.
+        """Create or reuse the layer and load initial features.
 
-        Raises:
-            Exception: if the initial API fetch fails (layer is still added to the
-                       project but will be empty until reload_layer() succeeds).
+        If a layer with the stored ID already exists in the project (e.g. loaded
+        from a saved project file) it is reused rather than duplicated.
         """
+        # Check if a previously created layer is still alive in the project.
+        stored_id, _ = QgsProject.instance().readEntry("BAPEBridge", "layer_id", "")
+        if stored_id:
+            existing = QgsProject.instance().mapLayer(stored_id)
+            if existing is not None and not sip.isdeleted(existing):
+                self.layer = existing
+                return  # layer already present — nothing more to do
+
+        # Guard against duplicate layers by name (e.g. toggled on twice).
+        for lyr in QgsProject.instance().mapLayers().values():
+            if lyr.name() in (self._NAME_OK, self._NAME_ERR):
+                self.layer = lyr
+                QgsProject.instance().writeEntry("BAPEBridge", "layer_id", lyr.id())
+                return
+
         self.layer = QgsVectorLayer("Point?crs=EPSG:4326", self._NAME_OK, "memory")
         if not self.layer.isValid():
             raise RuntimeError("Failed to create memory layer.")
@@ -54,6 +68,7 @@ class LocationLayerManager:
         self.layer.updateFields()
 
         QgsProject.instance().addMapLayer(self.layer)
+        QgsProject.instance().writeEntry("BAPEBridge", "layer_id", self.layer.id())
         self._configure_marker()
         self._configure_labels()