Retain single leading space when appending string in TypeLookUp

src/OmniSharp.Abstractions/Models/v1/TypeLookup/DocumentationComment.cs

@@ -147,7 +147,7 @@ public static DocumentationComment From(string xmlDocumentation, string lineEndi
         private static string TrimMultiLineString(string input, string lineEnding)
         {
             var lines = input.Split(new string[] { "\n", "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
-            return string.Join(lineEnding, lines.Select(l => l.TrimStart()));
+            return string.Join(lineEnding, lines.Select(l => RetainSingleLeadingSpace(l)));
         }
 
         private static string GetCref(string cref)
@@ -166,6 +166,16 @@ private static string GetCref(string cref)
             }
             return cref + " ";
         }
+
+        private static string RetainSingleLeadingSpace(string input)
+        {
+            if (string.IsNullOrWhiteSpace(input))
+                return string.Empty;
+            if (!Char.IsWhiteSpace(input[0]))
+                return input;
+            int offset = input.TakeWhile(c => char.IsWhiteSpace(c)).Count();
+            return " " + input.Substring(offset);
+        }
     }
 
     class DocumentationItemBuilder

tests/OmniSharp.Roslyn.CSharp.Tests/TypeLookupFacts.cs

@@ -452,7 +452,7 @@ public class TestClass
 }";
             var response = await GetTypeLookUpResponse(content);
             var expected =
-            @"DoWork is a method in the TestClass class. System.Console.WriteLine(System.String) for information about output statements.";
+            @"DoWork is a method in the TestClass class. System.Console.WriteLine(System.String)  for information about output statements.";
             Assert.Equal(expected, response.StructuredDocumentation.SummaryText);
         }
 
@@ -499,7 +499,7 @@ public class TestClass
 }";
             var response = await GetTypeLookUpResponse(content);
             var expected =
-            @"This sample shows how to call the TestClass.GetZero method.
+@"This sample shows how to call the TestClass.GetZero  method.
 
     class TestClass 
     {
@@ -629,5 +629,22 @@ class testissue
             @"Returns an array of type T .";
             Assert.Equal(expectedReturns, response.StructuredDocumentation.ReturnsText);
         }
+
+        [Fact]
+        public async Task StructuredDocumentationSpaceBeforeText()
+        {
+            string content = @"
+public class TestClass
+{
+    /// <summary><c>DoWork</c> is a method in the <c>TestClass</c> class.</summary>
+    public static void Do$$Work(int Int1)
+    {
+    }
+}";
+            var response = await GetTypeLookUpResponse(content);
+            var expected =
+            @"DoWork is a method in the TestClass class.";
+            Assert.Equal(expected, response.StructuredDocumentation.SummaryText);
+        }
     }
 }