cell-renderer-expander: fix rendering with GTK+3

There are basically three issues here:
- the renderer doesn't add the GTK_STYLE_CLASS_EXPANDER style class when
  rendering, which blocks the theme to apply the intended colors.
- the GtkStateFlags that were set on the context were using GTK_STATE_*
  instead of GTK_STATE_FLAG_*
- the flags set on the context were incomplete, as they were just using
  ACTIVE/NORMAL for expanded/collapsed and not SELECTED/FOCUSED/...

https://bugzilla.gnome.org/show_bug.cgi?id=650590

1 files changed, 8 insertions, 2 deletions

diff --git a/libempathy-gtk/empathy-cell-renderer-expander.c b/libempathy-gtk/empathy-cell-renderer-expander.c
index a38a0a5fb..7ed62b41f 100644
--- a/libempathy-gtk/empathy-cell-renderer-expander.c
+++ b/libempathy-gtk/empathy-cell-renderer-expander.c
@@ -275,6 +275,7 @@ empathy_cell_renderer_expander_render (GtkCellRenderer      *cell,
 	gint                            x_offset, y_offset;
 	guint                           xpad, ypad;
 	GtkStyleContext                 *style;
+	GtkStateFlags                    state;
 
 	expander = (EmpathyCellRendererExpander *) cell;
 	priv = GET_PRIV (expander);
@@ -292,11 +293,16 @@ empathy_cell_renderer_expander_render (GtkCellRenderer      *cell,
 	style = gtk_widget_get_style_context (widget);
 
 	gtk_style_context_save (style);
+	gtk_style_context_add_class (style, GTK_STYLE_CLASS_EXPANDER);
+
+	state = gtk_cell_renderer_get_state (cell, widget, flags);
 
 	if (priv->expander_style == GTK_EXPANDER_COLLAPSED)
-		gtk_style_context_set_state (style, GTK_STATE_NORMAL);
+		state |= GTK_STATE_FLAG_NORMAL;
 	else
-		gtk_style_context_set_state (style, GTK_STATE_ACTIVE);
+		state |= GTK_STATE_FLAG_ACTIVE;
+
+	gtk_style_context_set_state (style, state);
 
 	gtk_render_expander (style,
 			     cr,