[epiphany] Reset internal last open embed pointer after page reorder

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 38cbb617c791f162faecaf6ffdd326b73f32e139
Author: Jan-Michael Brummer <jan brummer tabos org>
Date:   Sat Jul 6 23:22:20 2019 +0200

    Reset internal last open embed pointer after page reorder
    
    Fixes: https://gitlab.gnome.org/GNOME/epiphany/issues/823

 src/ephy-window.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
---
diff --git a/src/ephy-window.c b/src/ephy-window.c
index ad4cb3be6..a5e59cf77 100644
--- a/src/ephy-window.c
+++ b/src/ephy-window.c
@@ -2976,6 +2976,17 @@ notebook_switch_page_cb (GtkNotebook *notebook,
   update_reader_mode (window, view);
 }
 
+static void
+notebook_page_reordered_cb (GtkNotebook *notebook,
+                            GtkWidget   *child,
+                            guint        page_num,
+                            gpointer     user_data)
+{
+  EphyWindow *window = EPHY_WINDOW (user_data);
+
+  window->last_opened_embed = NULL;
+}
+
 static GtkNotebook *
 setup_notebook (EphyWindow *window)
 {
@@ -3001,6 +3012,8 @@ setup_notebook (EphyWindow *window)
                     G_CALLBACK (notebook_page_removed_cb), window);
   g_signal_connect (notebook, "tab-close-request",
                     G_CALLBACK (notebook_page_close_request_cb), window);
+  g_signal_connect (notebook, "page-reordered",
+                    G_CALLBACK (notebook_page_reordered_cb), window);
 
   g_signal_connect_swapped (notebook, "open-link",
                             G_CALLBACK (ephy_link_open), window);