Double click on find all references view throws exception

[alexdima]

Moved from microsoft/vscode#8381

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From @isidorn

Refs: #8229

1. IE11 open https://microsoft.github.io/monaco-editor/index.html, TS sample
2. Find all references on something, double click inside find all references view
3. Notice exception in console

[alexdima]

@isidorn - This works for me now, not sure if it got fixed or we're doing things differently?

[isidorn]

@alexandrudima I am still getting this, I just double click inside the find all references view on IE11 and I get the exception in the console. Drop by my machine if you want to see it :)