fixes #4460

Author: retailcoder

Rubberduck.Core/AutoComplete/Service/SelfClosingPairCompletionService.cs

@@ -88,7 +88,7 @@ private CodeString HandleOpeningChar(SelfClosingPair pair, CodeString original)
             }
             else
             {
-                newCode = original.CaretPosition.StartColumn == line.Length
+                newCode = original.CaretPosition.StartColumn >= line.Length
                     ? line + autoCode
                     : line.Insert(original.CaretPosition.StartColumn, autoCode);
             }

Rubberduck.VBEEditor/SourceCodeHandling/CodePaneSourceCodeHandler.cs

@@ -91,15 +91,17 @@ public CodeString Prettify(ICodeModule module, CodeString original)
             var originalCode = original.Code.Replace("\r", string.Empty).Split('\n');
             var originalPosition = original.CaretPosition.StartColumn;
             var originalNonWhitespaceCharacters = 0;
+            var isAllWhitespace = true;
             for (var i = 0; i <= Math.Min(originalPosition - 1, originalCode[original.CaretPosition.StartLine].Length - 1); i++)
             {
                 if (originalCode[original.CaretPosition.StartLine][i] != ' ')
                 {
                     originalNonWhitespaceCharacters++;
+                    isAllWhitespace = false;
                 }
             }
 
-            var indent = originalCode[original.CaretPosition.StartLine].TakeWhile(c => c == ' ').Count();
+            var indent = original.CaretLine.TakeWhile(c => c == ' ').Count();
 
             module.DeleteLines(original.SnippetPosition.StartLine, original.SnippetPosition.LineCount);
             module.InsertLines(original.SnippetPosition.StartLine, string.Join("\r\n", originalCode));
@@ -126,9 +128,9 @@ public CodeString Prettify(ICodeModule module, CodeString original)
 
             var prettifiedPosition = new Selection(
                     original.SnippetPosition.ToZeroBased().StartLine + original.CaretPosition.StartLine,
-                    prettifiedCode[original.CaretPosition.StartLine].Trim().Length == 0
-                        ? indent
-                        : Math.Min(prettifiedCode[original.CaretPosition.StartLine].Length, original.CaretPosition.StartColumn))
+                    prettifiedCode[original.CaretPosition.StartLine].Trim().Length == 0 || (isAllWhitespace && !string.IsNullOrEmpty(original.CaretLine.Substring(original.CaretPosition.StartColumn).Trim()))
+                        ? Math.Min(indent, original.CaretPosition.StartColumn)
+                        : Math.Min(prettifiedCode[original.CaretPosition.StartLine].Length, prettifiedCaretCharIndex + 1))
                 .ToOneBased();
 
             SetSelection(module, prettifiedPosition);

RubberduckTests/AutoComplete/SelfClosingPairCompletionTests.cs

@@ -342,6 +342,18 @@ public void WhenCaretBetweenOpeningAndClosingChars_BackspaceRemovesBoth_Indented
             Assert.AreEqual(expected, result);
         }
 
+        [Test]
+        public void GivenEmptyIndentedLine_OpeningCharIsInsertedAtCaretPosition()
+        {
+            var pair = new SelfClosingPair('"', '"');
+            var input = '"';
+            var original = @"    |".ToCodeString();
+            var expected = @"    ""|""".ToCodeString();
+
+            var result = Run(pair, original, input);
+            Assert.AreEqual(expected, result);
+        }
+
         [Test]
         public void DeleteKey_ReturnsNull()
         {