diff -r 2b9f54d14cc2 -r 2947214c450e app-manager/packagelist.c
--- a/app-manager/packagelist.c	Sat Nov 15 19:04:45 2014 +0000
+++ b/app-manager/packagelist.c	Tue Apr 25 17:41:00 2023 +0100
@@ -20,8 +20,10 @@
 #include <stdlib.h>
 #include <string.h>
 #include <gtk/gtk.h>
+#include <plover/plover.h>
 #include <plover/package.h>
 #include <plover/packageset.h>
+#include <plover/yumrepository.h>
 #include <plover-gtk/packagestore.h>
 #include <plover-gtk/packagefilestore.h>
 #include "app-manager.h"
@@ -32,11 +34,18 @@
 
 void package_present(PloverPackage *package)
 {
-    gchar *s;
+    gchar *s,*prefix,*prefix_path;
     const char *text,*t;
+    char *multiple_prefixes="multiple";
+    GError *tmp_err=NULL;
+    GSList *sets,*repositories,*lnk;
     GtkWidget *w;
     GtkTextBuffer *buf;
+    GtkTreeModel *model;
+    struct comps *comps;
+    PloverPackageSet *set;
     PloverPackageFileStore *store;
+    PloverRepository *repository;
     buf=GTK_TEXT_BUFFER(gtk_builder_get_object(ui,"description"));
     if (package)
     {
@@ -44,7 +53,99 @@
 	g_strdelimit(s,"\t\n",' ');
     }
     else
-	s=g_strdup("");
+    {
+	model=gtk_tree_view_get_model(view);
+	while(model &&
+	  (GTK_IS_TREE_MODEL_FILTER(model) || GTK_IS_TREE_MODEL_SORT(model)))
+	{
+	    if (GTK_IS_TREE_MODEL_FILTER(model))
+		model=
+		  gtk_tree_model_filter_get_model(GTK_TREE_MODEL_FILTER(model));
+	    else
+		model=gtk_tree_model_sort_get_model(GTK_TREE_MODEL_SORT(model));
+	}
+	repositories=NULL;
+	prefix=NULL;
+	if (model && PLOVER_IS_PACKAGE_STORE(model))
+	{
+	    sets=plover_package_store_get_sets(PLOVER_PACKAGE_STORE(model));
+	    for(lnk=sets;lnk;lnk=lnk->next)
+	    {
+		set=lnk->data;
+		repository=plover_package_set_get_repository(set);
+		if (repository && !g_slist_find(repositories,repository))
+		    repositories=g_slist_prepend(repositories,repository);
+		t=plover_package_set_guess_prefix(set,tmp_err?NULL:&tmp_err);
+		if (!t)
+		    continue;
+		if (!prefix)
+		    prefix=g_strdup(t);
+		else if (prefix!=multiple_prefixes && strcmp(prefix,t))
+		{
+		    g_free(prefix);
+		    prefix=multiple_prefixes;
+		}
+	    }
+	    if (prefix==multiple_prefixes)
+		s=g_strdup("Multiple install prefixes");
+	    else if (repositories)
+	    {
+		if (prefix!=multiple_prefixes)
+		    g_free(prefix);
+		prefix=NULL;
+		for(lnk=repositories;lnk;lnk=lnk->next)
+		{
+		    repository=lnk->data;
+		    if (PLOVER_IS_YUM_REPOSITORY(repository))
+		    {
+			comps=plover_yum_repository_get_comps(
+			  PLOVER_YUM_REPOSITORY(repository),NULL);
+			t=plover_comps_get_default_prefix(comps);
+			if (!prefix)
+			    prefix=g_strdup(t);
+			else if (prefix!=multiple_prefixes && strcmp(prefix,t))
+			{
+			    g_free(prefix);
+			    prefix=multiple_prefixes;
+			}
+		    }
+		}
+		if (prefix==multiple_prefixes)
+		    s=g_strdup("Repositories intended to be installed to "
+		      "multiple destinations");
+		else if (prefix)
+		{
+		    prefix_path=razor_path_from_uri(prefix,NULL);
+		    s=g_strdup_printf("Repository intended to be installed to: "
+		      "%s",prefix_path?prefix_path:prefix);
+		    g_free(prefix_path);
+		}
+		else
+		    s=g_strdup("Repository with no default "
+		      "install destination");
+	    }
+	    else if (prefix)
+	    {
+		prefix_path=razor_path_from_uri(prefix,NULL);
+		s=g_strdup_printf("Installed in: %s",
+		  prefix_path?prefix_path:prefix);
+		g_free(prefix_path);
+	    }
+	    else if (sets)
+		s=g_strdup("No common installation destination found");
+	    else
+		s=g_strdup("Empty package store");
+	    if (prefix!=multiple_prefixes)
+		g_free(prefix);
+	    g_slist_free(repositories);
+	    g_clear_error(&tmp_err);
+	}
+	else if (model)
+	    s=g_strdup_printf("Unsupported package list container (%s)",
+	      G_OBJECT_TYPE_NAME(model));
+	else
+	    s=g_strdup("No Package list container");
+    }
     gtk_text_buffer_set_text(buf,s,-1);
     g_free(s);
     w=GTK_WIDGET(gtk_builder_get_object(ui,"PackageDetails"));
@@ -149,6 +250,33 @@
     }
 }
 
+static void package_inserted(GtkTreeModel *tree_model,GtkTreePath *path,
+  GtkTreeIter *iter,gpointer data)
+{
+    gchar *s;
+    s=gtk_tree_path_to_string(path);
+    g_message("package_inserted(%s): %sactive package",
+      s,active?"":"no ");
+    g_free(s);
+    if (!active)
+	package_present(NULL);
+}
+
+static void package_deleted(GtkTreeModel *tree_model,GtkTreePath *path,
+  gpointer data)
+{
+    /*
+     * If the deleted package was the active one, then selection-changed
+     * will be emitted which will handle that case.
+     */
+    gchar *s;
+    s=gtk_tree_path_to_string(path);
+    g_message("package_deleted(%s): %sactive package",s,active?"":"no ");
+    g_free(s);
+    if (!active)
+	package_present(NULL);
+}
+
 static void package_cell_data_func(GtkTreeViewColumn *column,
   GtkCellRenderer *cell,GtkTreeModel *model,GtkTreeIter *iter,gpointer data)
 {
@@ -169,9 +297,21 @@
 void set_package_model(GtkTreeModel *model)
 {
     GtkWidget *w;
+    GtkTreeModel *old_model;
     GtkTreeViewColumn *column;
     GtkCellRenderer *renderer;
     GtkTreeSelection *selection;
+    if (view)
+    {
+	old_model=gtk_tree_view_get_model(view);
+	if (old_model)
+	{
+	    g_signal_handlers_disconnect_by_func(old_model,
+	      G_CALLBACK(package_inserted),NULL);
+	    g_signal_handlers_disconnect_by_func(old_model,
+	      G_CALLBACK(package_deleted),NULL);
+	}
+    }
     if (!view)
     {
 	w=GTK_WIDGET(gtk_builder_get_object(ui,"Packages"));
@@ -218,9 +358,18 @@
     }
     if (view)
     {
+	g_warning("set_package_model: Calling gtk_tree_view_set_model()");
 	gtk_tree_view_set_model(view,model);
+	g_warning("set_package_model: gtk_tree_view_set_model() returns");
 	gtk_tree_view_set_search_column(view,
 	  PLOVER_PACKAGE_STORE_NAME_COLUMN);
+	if (model)
+	{
+	    g_signal_connect(model,"row-inserted",G_CALLBACK(package_inserted),
+	      NULL);
+	    g_signal_connect(model,"row-deleted",G_CALLBACK(package_deleted),
+	      NULL);
+	}
     }
     package_present(NULL);
 }