already exists class file,create new class file no warning

[fjqingyou]

Environment data

dotnet --info output: VS Code version: C# Extension version: C# for Visual Studio Code (powered by OmniSharp) 1.14.0 C# Extensions 1.3.0

Steps to reproduce

step1: I Test class have a Test Method, MyTest Mac OS system, have a ”New C# Class" menu, click it

step2: vscode show a new file name inputbox, input a existed class name

step3: press "enter" key , old Test.cs code been Erase

Expected behavior

if existed input name class file, show confirm replace view or intercept it input

Actual behavior

direct replace old file