Steps to Reproduce:

Things I tried:
Same thing here. Started in the friday (05/24/2019) release, I think.
Version: 1.8.0-insider (user setup)
Commit: 3e8f25d8642c9560f6296d97bde2b164aedf25df
Date: 2019-05-27T07:46:13.508Z
VS Code 1.33.1
Electron: 3.1.8
Chrome: 66.0.3359.181
Node.js: 10.2.0
V8: 6.6.346.32
OS: Windows_NT x64 10.0.18362
Still present in the new insiders release
Version: 1.8.0-insider (system setup)
Commit: 9a55ca3021f088a0781bf57070993bc2198de7e0
Date: 2019-05-29T07:42:26.310Z
VS Code 1.34.0
Electron: 3.1.8
Chrome: 66.0.3359.181
Node.js: 10.2.0
V8: 6.6.346.32
OS: Windows_NT x64 10.0.17134
It's really annoying to have to copy the contents of the file to a new tab in order to perform modifications to the original script content....
We'll have a fix out for this today.
Most helpful comment
We'll have a fix out for this today.