[gnome-software] Show the present and update version in the app row

[Richard Hughes <rhughes src gnome org>]

commit 01ed83c7eea411c59949cd9ec713a1e0f5bf3681
Author: Richard Hughes <richard hughsie com>
Date:   Thu Jul 7 20:37:59 2016 +0100

    Show the present and update version in the app row

 src/gs-app-row.c |   39 ++++++++++++++++++++++++++++++++++++---
 1 files changed, 36 insertions(+), 3 deletions(-)
---
diff --git a/src/gs-app-row.c b/src/gs-app-row.c
index cca5c5d..ff2507e 100644
--- a/src/gs-app-row.c
+++ b/src/gs-app-row.c
@@ -114,6 +114,38 @@ gs_app_row_get_description (GsAppRow *app_row)
        return g_string_new (tmp);
 }
 
+static gchar *
+gs_app_row_format_version_update (GsApp *app)
+{
+       const gchar *tmp;
+       const gchar *version_current = NULL;
+       const gchar *version_update = NULL;
+
+       /* current version */
+       tmp = gs_app_get_version_ui (app);
+       if (tmp != NULL && tmp[0] != '\0')
+               version_current = tmp;
+
+       /* update version */
+       tmp = gs_app_get_update_version_ui (app);
+       if (tmp != NULL && tmp[0] != '\0')
+               version_update = tmp;
+
+       /* have both */
+       if (version_current != NULL && version_update != NULL) {
+               return g_strdup_printf ("%s ▶ %s",
+                                       version_current,
+                                       version_update);
+       }
+
+       /* just update */
+       if (version_update)
+               return g_strdup (version_update);
+
+       /* we have nothing, nada, zilch */
+       return NULL;
+}
+
 void
 gs_app_row_refresh (GsAppRow *app_row)
 {
@@ -210,10 +242,11 @@ gs_app_row_refresh (GsAppRow *app_row)
        if (priv->show_update &&
            (gs_app_get_state (priv->app) == AS_APP_STATE_UPDATABLE ||
             gs_app_get_state (priv->app) == AS_APP_STATE_UPDATABLE_LIVE)) {
-               gtk_widget_show (priv->version_label);
+               g_autofree gchar *verstr = NULL;
+               verstr = gs_app_row_format_version_update (priv->app);
+               gtk_label_set_label (GTK_LABEL (priv->version_label), verstr);
+               gtk_widget_set_visible (priv->version_label, verstr != NULL);
                gtk_widget_hide (priv->star);
-               gtk_label_set_label (GTK_LABEL (priv->version_label),
-                                    gs_app_get_update_version_ui (priv->app));
        } else {
                gtk_widget_hide (priv->version_label);
                if (missing_search_result || gs_app_get_rating (priv->app) <= 0) {