Use untitled document for nonexisting file path in cmd

In the actual Vim, commands like ":e" do not create a file first if the path in the cmd doesn't exist. Rather, it creates an empty buffer and only create the file on write.
This commits changes the behavior to be more consistent with actual Vim by using untitled document instead creating the file if the file on the cmd is not found.

src/cmd_line/commands/file.ts

@@ -22,16 +22,6 @@ async function doesFileExist(fileUri: vscode.Uri) {
   }
 }
 
-async function createNewFile(fileUri: vscode.Uri) {
-  const activeTextEditor = vscode.window.activeTextEditor;
-  if (activeTextEditor) {
-    await vscode.workspace.fs.writeFile(fileUri, new Uint8Array());
-  } else {
-    // fallback to local fs
-    await util.promisify(fs.close)(await util.promisify(fs.open)(fileUri.fsPath, 'w'));
-  }
-}
-
 export enum FilePosition {
   NewWindowVerticalSplit,
   NewWindowHorizontalSplit,
@@ -149,9 +139,6 @@ export class FileCommand extends node.CommandBase {
         // If both with and without ext path do not exist
         if (!fileExists) {
           if (this.arguments.createFileIfNotExists) {
-            await createNewFile(uriPath);
-            fileUri = uriPath;
-          } else {
             // Change the scheme to untitled to open an
             // untitled tab
             fileUri = uriPath.with({ scheme: 'untitled' });