[epiphany] Set non detachable state for pinned tabs

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 77573686423cf15807e0a3b652793de0295c0f9a
Author: Jan-Michael Brummer <jan brummer tabos org>
Date:   Wed Nov 6 12:34:46 2019 +0100

    Set non detachable state for pinned tabs
    
    Fixes: https://gitlab.gnome.org/GNOME/epiphany/issues/969

 src/ephy-notebook.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/ephy-notebook.c b/src/ephy-notebook.c
index fc4c97bca..3c5bb2515 100644
--- a/src/ephy-notebook.c
+++ b/src/ephy-notebook.c
@@ -1025,6 +1025,7 @@ ephy_notebook_tab_set_pinned (EphyNotebook *notebook,
   gboolean expanded;
 
   gtk_notebook_set_tab_reorderable (GTK_NOTEBOOK (notebook), embed, !is_pinned);
+  gtk_notebook_set_tab_detachable (GTK_NOTEBOOK (notebook), embed, !is_pinned);
   tab_label = gtk_notebook_get_tab_label (GTK_NOTEBOOK (notebook), embed);
   ephy_tab_label_set_pinned (tab_label, is_pinned);