Use IsInMemory for workspace document saved state

Agent-Logs-Url: https://github.com/PowerShell/PowerShellEditorServices/sessions/b2f2d9b7-95c7-413b-8a23-7845a964c98a

Co-authored-by: JustinGrote <15258962+JustinGrote@users.noreply.github.com>

Author: Copilot

src/PowerShellEditorServices/Services/Extension/EditorOperationsService.cs

@@ -200,7 +200,7 @@ public async Task SaveFileAsync(string currentPath, string newSavePath)
 
         public WorkspaceOpenDocument[] GetWorkspaceOpenDocuments()
             => _workspaceService.GetOpenedFiles()
-                .Select(static scriptFile => new WorkspaceOpenDocument(scriptFile.FilePath, scriptFile.IsSaved))
+                .Select(static scriptFile => new WorkspaceOpenDocument(scriptFile.FilePath, !scriptFile.IsInMemory))
                 .ToArray();
 
         public string GetWorkspaceRelativePath(ScriptFile scriptFile) => _workspaceService.GetRelativePath(scriptFile);

src/PowerShellEditorServices/Services/TextDocument/Handlers/TextDocumentHandler.cs

@@ -137,7 +137,6 @@ public override async Task<Unit> Handle(DidSaveTextDocumentParams notification,
                     await _remoteFileManagerService.SaveRemoteFileAsync(savedFile.FilePath).ConfigureAwait(false);
                 }
 
-                savedFile.IsSaved = true;
             }
             return Unit.Value;
         }

src/PowerShellEditorServices/Services/TextDocument/ScriptFile.cs

@@ -55,11 +55,6 @@ internal sealed class ScriptFile
         /// </summary>
         public bool IsInMemory { get; }
 
-        /// <summary>
-        /// Gets or sets whether this file has no unsaved changes.
-        /// </summary>
-        public bool IsSaved { get; internal set; }
-
         /// <summary>
         /// Gets a string containing the full contents of the file.
         /// </summary>
@@ -142,7 +137,6 @@ internal ScriptFile(
 
             // SetFileContents() calls ParseFileContents() which initializes the rest of the properties.
             SetFileContents(textReader.ReadToEnd());
-            IsSaved = !IsInMemory;
             References = new ReferenceTable(this);
         }
 
@@ -370,7 +364,6 @@ public void ApplyChange(FileChange fileChange)
 
             // Parse the script again to be up-to-date
             ParseFileContents();
-            IsSaved = false;
             References.TagAsChanged();
         }