Settings error message is cropped off

[mborbola]

Issue Type: Bug

1. Go to settings
2. Search for 'tree'
3. Add invalid value to the Tree:Indent setting (last item in the settings list)

The error message is not be fully visible:

VS Code version: Code 1.31.0 (7c66f58, 2019-02-05T22:35:56.624Z)
OS version: Windows_NT x64 10.0.17134

[roblourens]

FYI @joaomoreno I will also need to override overflow on monaco-list-rows

[joaomoreno]

@roblourens Sure, go for it, only in settings editor.