Find and replace does not replace correctly when replacing many occurrences

[TomGroeneboer]

When trying to find & replace many occurrences at once, the value that is put in does not seem right.

E.g. if I try to replace 'Code.Abstractions' with 'MoreCode.Abstractions' at 500 occurrences in 100 files (or 4000 occurrences in 1200 files, does not matter), some occurrences (maybe 30-50) end up with 'CCode.Abstractions' or 'CodeAbstractions'. This seems to happen every time I try to mass replace a value.

• VSCode Version: Code 1.14.2 (cb82feb, 2017-07-19T23:34:09.706Z)
• OS Version: Windows_NT ia32 10.0.15063
• Extensions:

Extension	Author (truncated)	Version
vscode-eslint	dba	1.2.11
azure-functions-tools	joh	0.3.0
csharp	ms-	1.11.0
vscode-docker	Pet	0.0.16

Steps to Reproduce:

1. Open a large .NET solution
2. Replace a namespace occurrence that is used a lot with something else (try to hit 1000+ occurrences)

Reproduces without extensions: Yes

If you need any further information, please let me know!

[rebornix]

Considering it's multi file, pass to @roblourens

[roblourens]

Does it only happen in certain files, or randomly? Is there something different about the places where it happens - very long lines, non-utf8 encoding?

[TomGroeneboer]

It seems to happen randomly, we were trying to replace using statements in C# files created by the full blown Visual Studio. I guess these lines were around 50 characters each.

[TomGroeneboer]

Any updates on this?

[roblourens]

I haven't been able to repro it. Will have to investigate some more. Have you tried with 1.15?

[MynockSpit]

Might be different, but seems related. Check and see if the instances that failed to update correctly happened more than once on the same line.

[roblourens]

No, that's not related.

@TomGroeneboer Based on your description I think it's actually #35633 - affecting files encoded with a UTF8 BOM, and matches on the first line. That's now fixed in insiders.