Add minimal diff algorithm to API and use it when set on options

Author: Tom Smith

LibGit2Sharp/Diff.cs

@@ -53,6 +53,10 @@ private static GitDiffOptions BuildOptions(DiffModifiers diffOptions, FilePath[]
             {
                 options.Flags |= GitDiffOptionFlags.GIT_DIFF_PATIENCE;
             }
+            else if (compareOptions.Algorithm == DiffAlgorithm.Minimal)
+            {
+                options.Flags |= GitDiffOptionFlags.GIT_DIFF_MINIMAL;
+            }
 
             if (diffOptions.HasFlag(DiffModifiers.DisablePathspecMatch))
             {

LibGit2Sharp/DiffAlgorithm.cs

@@ -10,6 +10,11 @@ public enum DiffAlgorithm
         /// </summary>
         Meyers = 0,
 
+        /// <summary>
+        /// Use "minimal diff" algorithm when generating patches.
+        /// </summary>
+        Minimal = 1,
+
         /// <summary>
         /// Use "patience diff" algorithm when generating patches.
         /// </summary>