libview: fix text selection with mouse in annotation window

taken from:
GNOME/evince@91ac78b

libview/ev-annotation-window.c

@@ -280,12 +280,34 @@ ev_annotation_window_close (EvAnnotationWindow *window)
 	g_signal_emit (window, signals[CLOSED], 0);
 }
 
+static gboolean
+ev_annotation_window_button_press_event (GtkWidget      *widget,
+					 GdkEventButton *event)
+{
+	EvAnnotationWindow *window = EV_ANNOTATION_WINDOW (widget);
+
+	if (event->type == GDK_BUTTON_PRESS && event->button == 1) {
+		window->in_move = TRUE;
+		window->x = event->x_root - event->x;
+		window->y = event->y_root - event->y;
+		gtk_window_begin_move_drag (GTK_WINDOW (widget),
+					    event->button,
+					    event->x_root,
+					    event->y_root,
+					    event->time);
+		return TRUE;
+	}
+
+	return FALSE;
+}
+
 static void
 ev_annotation_window_init (EvAnnotationWindow *window)
 {
 	GtkWidget *vbox, *hbox;
 	GtkWidget *icon;
 	GtkWidget *swindow;
+	GtkWidget *header;
 	GtkIconTheme *icon_theme;
 	GdkPixbuf *pixbuf;
 
@@ -302,10 +324,19 @@ ev_annotation_window_init (EvAnnotationWindow *window)
 	gtk_box_pack_start (GTK_BOX (hbox), icon, FALSE, FALSE, 0);
 	gtk_widget_show (icon);
 
+	header = gtk_event_box_new ();
+	gtk_widget_add_events (header, GDK_BUTTON_PRESS_MASK);
+	g_signal_connect_swapped (header, "button-press-event",
+	                          G_CALLBACK (ev_annotation_window_button_press_event),
+	                          window);
+
 	window->title = gtk_label_new (NULL);
-	gtk_box_pack_start (GTK_BOX (hbox), window->title, TRUE, TRUE, 0);
+	gtk_container_add (GTK_CONTAINER (header), window->title);
 	gtk_widget_show (window->title);
 
+	gtk_box_pack_start (GTK_BOX (hbox), header, TRUE, TRUE, 0);
+	gtk_widget_show (header);
+
 	window->close_button = gtk_button_new ();
 	gtk_button_set_relief (GTK_BUTTON (window->close_button), GTK_RELIEF_NONE);
 	gtk_container_set_border_width (GTK_CONTAINER (window->close_button), 0);
@@ -464,27 +495,6 @@ ev_annotation_window_constructor (GType                  type,
 	return object;
 }
 
-static gboolean
-ev_annotation_window_button_press_event (GtkWidget      *widget,
-					 GdkEventButton *event)
-{
-	EvAnnotationWindow *window = EV_ANNOTATION_WINDOW (widget);
-
-	if (event->type == GDK_BUTTON_PRESS && event->button == 1) {
-		window->in_move = TRUE;
-		window->x = event->x_root - event->x;
-		window->y = event->y_root - event->y;
-		gtk_window_begin_move_drag (GTK_WINDOW (widget),
-					    event->button,
-					    event->x_root,
-					    event->y_root,
-					    event->time);
-		return TRUE;
-	}
-
-	return FALSE;
-}
-
 static gboolean
 ev_annotation_window_configure_event (GtkWidget         *widget,
 				      GdkEventConfigure *event)
@@ -543,7 +553,6 @@ ev_annotation_window_class_init (EvAnnotationWindowClass *klass)
 	g_object_class->set_property = ev_annotation_window_set_property;
 	g_object_class->dispose = ev_annotation_window_dispose;
 
-	gtk_widget_class->button_press_event = ev_annotation_window_button_press_event;
 	gtk_widget_class->configure_event = ev_annotation_window_configure_event;
 	gtk_widget_class->focus_in_event = ev_annotation_window_focus_in_event;
 	gtk_widget_class->focus_out_event = ev_annotation_window_focus_out_event;