Merge #1436: Fix CastException when installing from .ckan

* Postremus/install_ckan_crash_fix:
  Fix a castexception when installing metapackage The install logic still  used a KeyValuePair<GuiMod, GuiModChangeTyp> while everything else uses ModChange object's now

CHANGELOG.md

@@ -7,6 +7,7 @@ All notable changes to this project will be documented in this file.
 ### Bugfixes
 
 - [GUI] Re-ordering repositories in the settings panel is more stable. (Postremus, #1431)
+- [GUI] Fixed an unhandled exception that could occur when installing metapages via `Install -> From .ckan`. (Postremus, #1436)
 - [Core] Less likely to remove essential directories (such as `Ships/*`) if empty. (Postremus, #1405)
 
 ### Features

GUI/Main.cs

@@ -909,17 +909,18 @@ private void installFromckanToolStripMenuItem_Click(object sender, EventArgs e)
                 // Sneakily add our version in...
                 registry_manager.registry.AddAvailable(module);
 
-                var changeset = new List<KeyValuePair<GUIMod, GUIModChangeType>>();
-                changeset.Add(new KeyValuePair<GUIMod, GUIModChangeType>(
-                    new GUIMod(module,registry_manager.registry,CurrentInstance.Version()), GUIModChangeType.Install));
+                var changeset = new List<ModChange>();
+                changeset.Add(new ModChange(
+                    new GUIMod(module,registry_manager.registry,CurrentInstance.Version()),
+                    GUIModChangeType.Install, null));
 
                 menuStrip1.Enabled = false;
 
                 RelationshipResolverOptions install_ops = RelationshipResolver.DefaultOpts();
                 install_ops.with_recommends = false;
 
                 m_InstallWorker.RunWorkerAsync(
-                    new KeyValuePair<List<KeyValuePair<GUIMod, GUIModChangeType>>, RelationshipResolverOptions>(
+                    new KeyValuePair<List<ModChange>, RelationshipResolverOptions>(
                         changeset, install_ops));
                 m_Changeset = null;