Added option to disable auto-sort

Added a "more settings" group box and  a textbox do disable auto-sort.

GUI/Configuration.cs

@@ -19,6 +19,8 @@ public class Configuration
         public bool RefreshOnStartup = true; // Defaults to true, so everyone is forced to refresh on first start
         public bool RefreshOnStartupNoNag = false;
 
+        public bool AutoSortByUpdate = true;
+
         public int ActiveFilter = 0;
 
         // Sort by the mod name (index = 2) column by default

GUI/Main.cs

@@ -477,20 +477,27 @@ private void MarkAllUpdatesToolButton_Click(object sender, EventArgs e)
                 }
             }
 
-            // set new sort column
-            var new_sort_column = ModList.Columns[1];
-            var current_sort_column = ModList.Columns[configuration.SortByColumnIndex];
-
-            // Reset the glyph.
-            current_sort_column.HeaderCell.SortGlyphDirection = SortOrder.None;
-            configuration.SortByColumnIndex = new_sort_column.Index;
-            UpdateFilters(this);
+            // only sort by Update column if checkbox in settings checked
+            if (Main.Instance.configuration.AutoSortByUpdate)
+            {
+                // set new sort column
+                var new_sort_column = ModList.Columns[1];
+                var current_sort_column = ModList.Columns[configuration.SortByColumnIndex];
+
+                // Reset the glyph.
+                current_sort_column.HeaderCell.SortGlyphDirection = SortOrder.None;
+                configuration.SortByColumnIndex = new_sort_column.Index;
+                UpdateFilters(this);
+
+                // Selects the top row and scrolls the list to it.
+                DataGridViewCell cell = ModList.Rows[0].Cells[2];
+                ModList.CurrentCell = cell;
+
+            }
 
             ModList.Refresh();
 
-            // Selects the top/bottom row and scrolls the list to it.
-            DataGridViewCell cell = ModList.Rows[0].Cells[2];
-            ModList.CurrentCell = cell;
+
         }
 
         public void UpdateModContentsTree(CkanModule module, bool force = false)