Fixed argument out of range exception when indenting python code.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/3.0@5519 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/BackendBindings/Python/PythonBinding/Project/Src/PythonFormattingStrategy.cs

@@ -20,6 +20,10 @@ namespace ICSharpCode.PythonBinding
 		
 		protected override int SmartIndentLine(TextArea textArea, int line)
 		{
+			if (line == 0) {
+				return base.SmartIndentLine(textArea, line);
+			}
+			
 			IDocument document = textArea.Document;
 			LineSegment previousLine = document.GetLineSegment(line - 1);
 			string previousLineText = document.GetText(previousLine).Trim();

src/AddIns/BackendBindings/Python/PythonBinding/Test/PythonIndentationTests.cs

@@ -200,6 +200,18 @@ namespace PythonBinding.Tests.Indentation
 								"\t";
 			
 			Assert.AreEqual(expectedText, textEditor.Text);
-		}		
+		}
+		
+		[Test]
+		public void IndentingFirstLineDoesNotThrowArgumentOutOfRangeException()
+		{
+			textEditor.Text = "print 'hello'";
+			
+			int indentResult = -1;
+			Assert.DoesNotThrow(delegate { indentResult =
+				formattingStrategy.IndentLine(textEditor.ActiveTextAreaControl.TextArea, 0); });
+			
+			Assert.AreEqual("print 'hello'", textEditor.Text);
+		}
 	}
 }