[gnome-todo] task-row: Fix DnD background color

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit e65e6414df6eca039073d61d282473715edcbd72
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Wed Sep 5 11:31:36 2018 -0300

    task-row: Fix DnD background color

 src/task-list-view/gtd-task-row.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/task-list-view/gtd-task-row.c b/src/task-list-view/gtd-task-row.c
index ec7af7c..d9b3d3b 100644
--- a/src/task-list-view/gtd-task-row.c
+++ b/src/task-list-view/gtd-task-row.c
@@ -184,6 +184,9 @@ create_transient_row (GtdTaskRow *self)
 
   gtk_revealer_set_reveal_child (GTK_REVEALER (new_row->edit_panel_revealer), self->active);
 
+  gtk_style_context_add_class (gtk_widget_get_style_context (GTK_WIDGET (new_row)), "background");
+  gtk_widget_set_opacity (GTK_WIDGET (new_row), 0.5);
+
   return GTK_WIDGET (new_row);
 }