[folding] Search doesn't un-collapse section if also switching files

[ghost]

• VSCode Version: Code - Insiders 1.20.0-insider (2bab83a, 2018-01-10T06:16:46.780Z)
• OS Version: Linux x64 4.4.0-21-generic
• Extensions: none

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Steps to Reproduce:

1. Create a.ts and write:

function f() {
    searchtext;
}

2. Collapse the function.
3. Create b.ts (without closing a.ts).
4. Ctrl-shift-f, type searchtext, and hit enter. You should see a result in a.ts.
5. Click on the result and you are navigated to a.ts -- but you can't see searchtext anywhere since f is still collapsed.
6. It will uncollapse if you click on searchtext a second time while still looking at a.ts.

[ghost]

This problem also affects go-to-definition:
a.ts

namespace N {
    export function f() {}
}

b.ts

N.f();

Collapse a.ts and go-to-definition on f in b.ts -- I would expect it to expand sections as necessary to get me to the definition, but instead I'm just left at the top of the file.

[ewerybody]

Is this hard to fix?! It's pretty annoying. I collapse a lot :/