New application does not do the right thing if parent folder is already open in editor

[keertip]

File > New application. Select as parent a folder that is already open and shown in the Files view. New application creates a new project opens it as a separate node, instead of just creating the files and showing it the open folder.

[keertip]

https://chromiumcodereview.appspot.com/10021055/

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Added Fixed label.