Fixed null reference exception that could occur if the TextBoxTextChanged event was fired before the XmlTreeEditor was created.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/3.0@3599 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/DisplayBindings/XmlEditor/Project/Src/XmlTreeViewContainerControl.cs

@@ -808,9 +808,11 @@ namespace ICSharpCode.XmlEditor
 		/// </summary>
 		protected void TextBoxTextChanged(object sender, EventArgs e)
 		{
-			bool previousIsDirty = dirty;
-			editor.TextContentChanged();
-			OnXmlChanged(previousIsDirty);
+			if (editor != null) {
+				bool previousIsDirty = dirty;
+				editor.TextContentChanged();
+				OnXmlChanged(previousIsDirty);
+			}
 		}
 		
 		/// <summary>

src/AddIns/DisplayBindings/XmlEditor/Test/Tree/TextBoxTextChangedBeforeEditorLoadedTestFixture.cs

@@ -0,0 +1,33 @@
+// <file>
+//     <copyright see="prj:///doc/copyright.txt"/>
+//     <license see="prj:///doc/license.txt"/>
+//     <owner name="Matthew Ward" email="mrward@users.sourceforge.net"/>
+//     <version>$Revision$</version>
+// </file>
+
+using System;
+using System.Windows.Forms;
+using System.Xml;
+
+using ICSharpCode.Core;
+using ICSharpCode.XmlEditor;
+using NUnit.Framework;
+using XmlEditor.Tests.Utils;
+
+namespace XmlEditor.Tests.Tree
+{
+	/// <summary>
+	/// Fixes a null exception that could occur if the TextBoxTextChanged event is fired before the
+	/// XmlTreeEditor is created.
+	/// </summary>
+	[TestFixture]
+	public class TextBoxTextChangedBeforeEditorLoadedTestFixture
+	{
+		[Test]
+		public void FireTextBoxTextChangedEventBeforeXmlTreeEditorCreated()
+		{
+			DerivedXmlTreeViewContainerControl treeViewContainer = new DerivedXmlTreeViewContainerControl();
+			treeViewContainer.CallTextBoxTextChanged();
+		}
+	}
+}

src/AddIns/DisplayBindings/XmlEditor/Test/XmlEditor.Tests.csproj

@@ -90,6 +90,7 @@
     <Compile Include="Tree\RemoveElementTestFixture.cs" />
     <Compile Include="Tree\RemoveTextNodesFromTreeControlTestFixture.cs" />
     <Compile Include="Tree\RemoveTextNodeTestFixture.cs" />
+    <Compile Include="Tree\TextBoxTextChangedBeforeEditorLoadedTestFixture.cs" />
     <Compile Include="Tree\XmlCommentTreeNodeTests.cs" />
     <Compile Include="Tree\XmlTreeViewClipboardHandlerTestFixture.cs" />
     <Compile Include="Tree\XmlTreeViewContainerTestFixture.cs" />