preview extra lines

src/extension.ts

@@ -119,11 +119,21 @@ async function autocompleteCommand(textEditor: vscode.TextEditor, cancellationTo
                 // Calculate the number of new lines in the completion, plus 2 extra lines
                 const totalNewLines = newLines.length + 2;
 
-                // Create preview decorations
+                // Create preview decorations and insert new lines
                 const previewRanges: vscode.DecorationOptions[] = [];
+                const edit = new vscode.WorkspaceEdit();
+                const document = textEditor.document;
+
                 for (let i = 0; i < totalNewLines; i++) {
                     const lineContent = i < newLines.length ? newLines[i] : '';
-                    const range = new vscode.Range(startLine + i, 0, startLine + i + 1, 0);
+                    const position = new vscode.Position(startLine + i, 0);
+                    
+                    // Insert a new line
+                    edit.insert(document.uri, position, '\n');
+                    
+                    // Create a range for the newly inserted line
+                    const range = new vscode.Range(position, position.translate(1, 0));
+                    
                     previewRanges.push({
                         range,
                         renderOptions: {
@@ -134,12 +144,15 @@ async function autocompleteCommand(textEditor: vscode.TextEditor, cancellationTo
                     });
                 }
 
+                // Apply the edit to insert new lines
+                await vscode.workspace.applyEdit(edit);
+
+                // Set decorations on the newly inserted lines
                 textEditor.setDecorations(previewDecorationType, previewRanges);
 
                 let previewInserted = true;
 
                // Handle preview acceptance or dismissal
-               // Handle preview acceptance or dismissal
                const disposable = vscode.workspace.onDidChangeTextDocument(async (event) => {
                 if (event.document.uri.toString() === document.uri.toString()) {
                     const change = event.contentChanges[0];