[gnome-software/1895-can-t-install-a-local-rpm-package-anymore-install-button-missing] gs-details-page: Filter out alternatives without origin

[Milan Crha <mcrha src gnome org>]

commit e706a530aeeba360fd60fa7ccde63a147f1e14d4
Author: Milan Crha <mcrha redhat com>
Date:   Wed Sep 7 16:18:50 2022 +0200

    gs-details-page: Filter out alternatives without origin
    
    When an alternative app has no origin set, it cannot be installed or
    even shown in the GUI, thus filter such alternatives out.
    
    Helps https://gitlab.gnome.org/GNOME/gnome-software/-/issues/1895

 src/gs-details-page.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/src/gs-details-page.c b/src/gs-details-page.c
index cfe3cc797..d35ee0a98 100644
--- a/src/gs-details-page.c
+++ b/src/gs-details-page.c
@@ -1637,6 +1637,16 @@ _set_app (GsDetailsPage *self, GsApp *app)
                                 self, 0);
 }
 
+static gboolean
+gs_details_page_filter_origin (GsApp *app,
+                              gpointer user_data)
+{
+       /* Keep only local apps or those, which have an origin set */
+       return gs_app_get_state (app) == GS_APP_STATE_AVAILABLE_LOCAL ||
+              gs_app_get_local_file (app) != NULL ||
+              gs_app_get_origin (app) != NULL;
+}
+
 /* show the UI and do operations that should not block page load */
 static void
 gs_details_page_load_stage2 (GsDetailsPage *self,
@@ -1676,6 +1686,7 @@ gs_details_page_load_stage2 (GsDetailsPage *self,
        query = gs_app_query_new ("alternate-of", self->app,
                                  "refine-flags", GS_DETAILS_PAGE_REFINE_FLAGS,
                                  "dedupe-flags", GS_APP_LIST_FILTER_FLAG_NONE,
+                                 "filter-func", gs_details_page_filter_origin,
                                  "sort-func", gs_utils_app_sort_priority,
                                  NULL);
        plugin_job2 = gs_plugin_job_list_apps_new (query, GS_PLUGIN_LIST_APPS_FLAGS_INTERACTIVE);