Describe the bug

Formatter crashes unexpectedly.

To Reproduce

1. Open a new tab.
2. Make 3 new lines.
3. Format the code.
4. Get [Format command returned non-zero exit code -1073741819].

It happens with a high probability, but not always for me.

Expected behavior

The formatter won't crash.

Screenshots

Desktop (please complete the following information):

• OS: Window 10
• Version: cb333ed

Smartphone (please complete the following information):

N/A

Additional context

I think it happens because the file is occupied by the editor, and clang-format can't modify it.

I suggest using clang-format by its output, instead of the -i option. It will not only fix this bug, but also support undo for formatting.

I'll try to fix it tomorrow.