From 8d76bdf1efced3360aaea7df500156aa87c80411 Mon Sep 17 00:00:00 2001
From: Gergely Polonkai <gergely@polonkai.eu>
Date: Sat, 2 Aug 2014 20:00:24 +0200
Subject: [PATCH] ag_window_new_chart_action() goes to chart tab if chart was
 not correctly closed

---
 src/ag-window.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/ag-window.c b/src/ag-window.c
index 6dcb6dd..f244b3c 100644
--- a/src/ag-window.c
+++ b/src/ag-window.c
@@ -983,6 +983,20 @@ ag_window_new_chart_action(GSimpleAction *action,
     AgWindow        *window = AG_WINDOW(user_data);
     AgWindowPrivate *priv   = ag_window_get_instance_private(window);
 
+    if (priv->chart) {
+        ag_app_message_dialog(
+                GTK_WIDGET(window),
+                GTK_MESSAGE_ERROR,
+                "This window already has a chart. " \
+                "This should not happen, " \
+                "please consider issuing a bug report!"
+            );
+
+        gtk_stack_set_visible_child_name(GTK_STACK(priv->stack), "chart");
+
+        return;
+    }
+
     gtk_stack_set_visible_child_name(GTK_STACK(priv->stack), "edit");
 }