Search viewlet searching opened files regardless or include and exclude patterns

[Tyriar]

• VSCode Version: Code - Insiders 1.15.0-insider (f39385b, 2017-08-01T05:16:44.254Z)
• OS Version: Windows_NT x64 10.0.14393
• Extensions:

Extension	Author (truncated)	Version
git-project-manager	fel	1.3.2
seti-icons	qin	0.1.3

(1 theme extensions excluded)

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Testing #31480

Searching https://github.com/sourcelair/xterm.js, notice that dist is excluded in settings, I have an explicit include setting, but because dist/xterm.js is opened (not active) search results are still presented.

[roblourens]

I did miss a case

[Tyriar]

This is also causing the results to look particularly confusing when there actually are results:

Notice that the other results are in ./src but it's not shown next to the files because there's an assumption that only 1 folder is showing.

[mjbvz]

I'm still seeing results from non-active opened files returned even though they are excluded by search.exclude:

@roblourens Are these the correct test steps?