Fixed SD2-961 - Null reference exception on performing a find next on a reopened file. The ProvidedDocumentInformation now has an Equals method which takes into account if the TextAreaControl is different. This Equals method is now used instead of only comparing the filenames so the search can determine if the document has been closed and reopened and a new ProvidedDocumentInformation instance will be required.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/2.1@2301 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/Base/Project/Src/TextEditor/SearchAndReplace/Engine/DocumentIterator/ProvidedDocumentInformation.cs

@@ -87,6 +87,21 @@ namespace SearchAndReplace
 			return new DocumentFactory().CreateFromTextBuffer(textBuffer);
 		}		
 		
+		public override bool Equals(object obj)
+		{
+			ProvidedDocumentInformation info = obj as ProvidedDocumentInformation;
+			if (info == null) {
+				return false;
+			}
+			return this.fileName == info.fileName && 
+				this.textAreaControl == info.textAreaControl;
+		}
+		
+		public override int GetHashCode()
+		{
+			return fileName.GetHashCode();
+		}
+		
 		public ProvidedDocumentInformation(IDocument document, string fileName, int currentOffset)
 		{
 			this.document      = document;

src/Main/Base/Project/Src/TextEditor/SearchAndReplace/Engine/Search.cs

@@ -88,8 +88,9 @@ namespace SearchAndReplace
 			Debug.Assert(textIteratorBuilder != null);
 			
 			if (info != null && textIterator != null && documentIterator.CurrentFileName != null) {
-				if (info.FileName != documentIterator.CurrentFileName) { // create new iterator, if document changed
+				ProvidedDocumentInformation currentInfo = documentIterator.Current;
-					info         = documentIterator.Current;
+				if (!info.Equals(currentInfo)) { // create new iterator, if document changed
+					info         = currentInfo;
 					textIterator = textIteratorBuilder.BuildTextIterator(info);
 				} else { // old document -> initialize iterator position to caret pos
 					textIterator.Position = info.CurrentOffset;
@@ -120,8 +121,9 @@ namespace SearchAndReplace
 		public SearchResult FindNext(int offset, int length)
 		{
 			if (info != null && textIterator != null && documentIterator.CurrentFileName != null) {
-				if (info.FileName != documentIterator.CurrentFileName) { // create new iterator, if document changed
+				ProvidedDocumentInformation currentInfo = documentIterator.Current;
-					info         = documentIterator.Current;
+				if (!info.Equals(currentInfo)) { // create new iterator, if document changed
+					info         = currentInfo;
 					textIterator = textIteratorBuilder.BuildTextIterator(info);
 				} else { // old document -> initialize iterator position to caret pos
 					textIterator.Position = info.CurrentOffset;