[gnome-software] snap: Don't override installed version with store version

[Robert Ancell <rancell src gnome org>]

commit 0f063792b8f44288e45f141706ab82a04e4c0c26
Author: Robert Ancell <robert ancell canonical com>
Date:   Fri Nov 24 15:49:20 2017 +1300

    snap: Don't override installed version with store version

 plugins/snap/gs-plugin-snap.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/plugins/snap/gs-plugin-snap.c b/plugins/snap/gs-plugin-snap.c
index 0d3caa8..9c0468f 100644
--- a/plugins/snap/gs-plugin-snap.c
+++ b/plugins/snap/gs-plugin-snap.c
@@ -729,7 +729,6 @@ gs_plugin_refine_app (GsPlugin *plugin,
                GPtrArray *screenshots;
                const gchar *name;
                g_autofree gchar *description = NULL;
-               g_autofree gchar *version = NULL;
 
                if (gs_app_get_state (app) == AS_APP_STATE_UNKNOWN)
                        gs_app_set_state (app, AS_APP_STATE_AVAILABLE);
@@ -743,8 +742,11 @@ gs_plugin_refine_app (GsPlugin *plugin,
                if (description != NULL)
                        gs_app_set_description (app, GS_APP_QUALITY_NORMAL, description);
                gs_app_set_license (app, GS_APP_QUALITY_NORMAL, snapd_snap_get_license (store_snap));
-               version = g_strdup_printf ("%s (%s)", snapd_snap_get_version (store_snap), 
snapd_snap_get_revision (store_snap));
-               gs_app_set_version (app, version);
+               if (gs_app_get_version (app) == NULL) {
+                       g_autofree gchar *version = NULL;
+                       version = g_strdup_printf ("%s (%s)", snapd_snap_get_version (store_snap), 
snapd_snap_get_revision (store_snap));
+                       gs_app_set_version (app, version);
+               }
                gs_app_set_size_download (app, snapd_snap_get_download_size (store_snap));
                gs_app_set_developer_name (app, snapd_snap_get_developer (store_snap));
                if (icon_url == NULL) {