Vscode-cpptools: The formatting tool is not working properly

[langyo]

Type: LanguageService

Describe the bug

• OS and Version: Windows 10.0.17763.678
• VS Code Version: 1.37.1
• C/C++ Extension Version: 0.24.1
• After formatting, the formatted text is not replaced but appended to the end of the text.

To Reproduce

1. Open a c++ file.
2. Copy some source code into it.
3. Right-click to format.
4. See error.

Expected behavior
Replace old text with new text instead of appending directly to the end of the file.

Screenshots

Additional context
The code I am going to format is that I copied it directly from the other place to the editing area.

[sean-mcmanus]

I believe this is a duplicate of https://github.com/microsoft/vscode-cpptools/issues/4091 (although your repro steps are slightly different). The document is becoming corrupted when it's saved and the formatting is revealing the corrupted document.

[michelleangela]

Closing as duplicate.