Error using 'sidebar find / replace'

[garfieldbanks]

• VSCode Version: 1.8.1
• OS Version: Windows 10

In my actual project, I tried to use the 'sidebar find / replace' to replace '\n ' with just '\n'. The error:

I then tried reproducing it on a fresh instance of VSCode with a single file. Again, using the 'sidebar find / replace', to replace '\n ' with just '\n'. There was no visible error message this time, but VSCode failed to actually make the replacement:

I then tried using the 'single file find / replace' and it successfully made the replacement:

So the issue is with the 'sidebar find / replace' only.

[sandy081]

Could be related to #13068

[sandy081]

There is no multi-line search supported. Hence this is making it as a dup of #13155