Fix SD-1777 - 'Replace all' (in project) does not perform any replacements in files that are not open

src/AddIns/Misc/SearchAndReplace/Project/Engine/SearchReplaceManager.cs

@@ -215,7 +215,7 @@ namespace SearchAndReplace
 					if (textArea != null) {
 						string transformedPattern = result.TransformReplacePattern(SearchOptions.ReplacePattern);
 						find.Replace(result.Offset, result.Length, transformedPattern);
-						if (!find.CurrentDocumentInformation.IsDocumentCreated) {
+						if (find.CurrentDocumentInformation.IsDocumentCreatedFromTextBuffer) {
 							textArea.Document.Replace(result.Offset, result.Length, transformedPattern);
 						}
 					} else {

src/Main/Base/Project/Src/Editor/Search/ProvidedDocumentInformation.cs

@@ -15,6 +15,7 @@ namespace ICSharpCode.SharpDevelop.Editor.Search
 		ITextBuffer textBuffer;
 		FileName fileName;
 		int currentOffset;
+		bool documentCreatedFromTextBuffer;
 		
 		public FileName FileName {
 			get {
@@ -35,8 +36,8 @@ namespace ICSharpCode.SharpDevelop.Editor.Search
 			}
 		}
 		
-		public bool IsDocumentCreated {
+		public bool IsDocumentCreatedFromTextBuffer {
-			get { return document != null; }
+			get { return documentCreatedFromTextBuffer; }
 		}
 		
 		public int CurrentOffset {
@@ -109,6 +110,7 @@ namespace ICSharpCode.SharpDevelop.Editor.Search
 			this.textBuffer    = textBuffer;
 			this.fileName      = FileName.Create(fileName);
 			this.endOffset = this.currentOffset = currentOffset;
+			documentCreatedFromTextBuffer = true;
 		}
 	}
 }