Refresh section on first tab open (not just revisit)

Author: yakutovicha

control.ipynb

@@ -48,25 +48,25 @@
     "    name = section_names[index]\n",
     "    placeholder = placeholders[index]\n",
     "    widget = section_instances.get(name)\n",
-    "    if widget is not None:\n",
-    "        # Cached: just refresh if the section supports it.\n",
-    "        refresher = getattr(widget, \"refresh\", None)\n",
-    "        if callable(refresher):\n",
-    "            refresher()\n",
-    "        return\n",
-    "    try:\n",
-    "        widget = sections[name]()\n",
-    "    except Exception as exc:\n",
-    "        # Show the error but do NOT cache it: revisiting the tab retries.\n",
-    "        placeholder.children = [\n",
-    "            ipw.HTML(\n",
-    "                f'<div class=\"alert alert-danger\" role=\"alert\">'\n",
-    "                f'Failed to open the \"{name}\" section: {exc}</div>'\n",
-    "            )\n",
-    "        ]\n",
-    "        return\n",
-    "    section_instances[name] = widget\n",
-    "    placeholder.children = [widget]\n",
+    "    if widget is None:\n",
+    "        try:\n",
+    "            widget = sections[name]()\n",
+    "        except Exception as exc:\n",
+    "            # Show the error but do NOT cache it: revisiting the tab retries.\n",
+    "            placeholder.children = [\n",
+    "                ipw.HTML(\n",
+    "                    f'<div class=\"alert alert-danger\" role=\"alert\">'\n",
+    "                    f'Failed to open the \"{name}\" section: {exc}</div>'\n",
+    "                )\n",
+    "            ]\n",
+    "            return\n",
+    "        section_instances[name] = widget\n",
+    "        placeholder.children = [widget]\n",
+    "\n",
+    "    # First open and every revisit both probe for fresh data.\n",
+    "    refresher = getattr(widget, \"refresh\", None)\n",
+    "    if callable(refresher):\n",
+    "        refresher()\n",
     "\n",
     "\n",
     "def on_tab_change(change):\n",