Make retry work if downloads fail

GUI/Main.cs

@@ -974,7 +974,6 @@ await mainModList.ComputeChangeSetFromModList(
                                 install_ops
                             )
                         );
-                        UpdateChangesDialog(null, installWorker);
                         ShowWaitDialog();
                     }
                 }

GUI/MainChangeset.cs

@@ -32,7 +32,7 @@ public void UpdateChangesDialog(List<ModChange> changeset, BackgroundWorker inst
 
             IEnumerable<ModChange> leftOver = changeset.Where(change => change.ChangeType != GUIModChangeType.Remove
                                                 && change.ChangeType != GUIModChangeType.Update);
-            
+
             // Now make our list more human-friendly (dependencies for a mod are listed directly
             // after it.)
             CreateSortedModList(leftOver);
@@ -74,7 +74,7 @@ public void UpdateChangesDialog(List<ModChange> changeset, BackgroundWorker inst
         /// It arranges the changeset in a human-friendly order
         /// The requested mod is listed first, it's dependencies right after it
         /// So we get for example "ModuleRCSFX" directly after "USI Exploration Pack"
-        /// 
+        ///
         /// It is very likely that this is forward-compatible with new ChangeTypes's,
         /// like a a "reconfigure" changetype, but only the future will tell
         /// </summary>
@@ -116,13 +116,12 @@ private void ConfirmChangesButton_Click(object sender, EventArgs e)
             //Using the changeset passed in can cause issues with versions.
             // An example is Mechjeb for FAR at 25/06/2015 with a 1.0.2 install.
             // TODO Work out why this is.
-            var user_change_set = mainModList.ComputeUserChangeSet().ToList();
             installWorker.RunWorkerAsync(
                 new KeyValuePair<List<ModChange>, RelationshipResolverOptions>(
-                    user_change_set, install_ops));
-            changeSet = null;
-
-            UpdateChangesDialog(null, installWorker);
+                    mainModList.ComputeUserChangeSet().ToList(),
+                    install_ops
+                )
+            );
             ShowWaitDialog();
         }
 

GUI/MainInstall.cs

@@ -301,12 +301,13 @@ private void PostInstallMods(object sender, RunWorkerCompletedEventArgs e)
         {
             KeyValuePair<bool, ModChanges> result = (KeyValuePair<bool, ModChanges>) e.Result;
 
-            UpdateModsList(false, result.Value);
-
             tabController.SetTabLock(false);
 
             if (result.Key)
             {
+                // Rebuilds the list of GUIMods
+                UpdateModsList(false, result.Value);
+
                 if (modChangedCallback != null)
                 {
                     foreach (var mod in result.Value)
@@ -320,13 +321,15 @@ private void PostInstallMods(object sender, RunWorkerCompletedEventArgs e)
                 HideWaitDialog(true);
                 tabController.HideTab("ChangesetTabPage");
                 ApplyToolButton.Enabled = false;
+                UpdateChangesDialog(null, installWorker);
             }
             else
             {
-                // there was an error
-                // rollback user's choices but stay on the log dialog
+                // There was an error
+                // Stay on the log dialog and re-apply the user's change set to allow retry
                 AddStatusMessage("Error!");
                 SetDescription("An error occurred, check the log for information");
+                UpdateChangesDialog(result.Value, installWorker);
                 Util.Invoke(DialogProgressBar, () => DialogProgressBar.Style = ProgressBarStyle.Continuous);
                 Util.Invoke(DialogProgressBar, () => DialogProgressBar.Value = 0);
             }

GUI/MainModList.cs

@@ -653,13 +653,13 @@ public static Dictionary<GUIMod, string> ComputeConflictsFromModList(IRegistryQu
 
         public HashSet<ModChange> ComputeUserChangeSet()
         {
-            var changes = Modules.Where(mod => mod.IsInstallable()).Select(mod => mod.GetRequestedChange());
-            var changeset = new HashSet<ModChange>(
-                changes.Where(change => change.HasValue).
+            return new HashSet<ModChange>(Modules.
+                Where(mod => mod.IsInstallable()).
+                Select(mod => mod.GetRequestedChange()).
+                Where(change => change.HasValue).
                 Select(change => change.Value).
                 Select(change => new ModChange(change.Key, change.Value, null))
-                );
-            return changeset;
+            );
         }
     }
 }