fixes NB#66301

pmo-trunk-r3035

diff --git a/src/widgets/modest-header-view.c b/src/widgets/modest-header-view.c
index 4206dc2..c925f6f 100644 (file)
--- a/src/widgets/modest-header-view.c
+++ b/src/widgets/modest-header-view.c
@@ -1339,9 +1339,18 @@ drag_data_get_cb (GtkWidget *widget, GdkDragContext *context,
        GtkTreeIter iter;
        GtkTreePath *source_row = NULL;
        GtkTreeSelection *sel = NULL;   
+       ModestWindowMgr *mgr = NULL;
+       TnyHeader *header = NULL;
        
        source_row = get_selected_row (GTK_TREE_VIEW (widget), &model);
+       
        if ((source_row == NULL) || (!gtk_tree_model_get_iter(model, &iter, source_row))) return;
+       gtk_tree_model_get (model, &iter,
+                           TNY_GTK_HEADER_LIST_MODEL_INSTANCE_COLUMN,
+                           &header, -1);
+       mgr = modest_runtime_get_window_mgr ();
+       if (modest_window_mgr_find_registered_header(mgr, header, NULL))
+               return;
 
        switch (info) {
        case MODEST_HEADER_ROW: