[Feature] PrintHelper Multi-Window

[mabbond]

Hi, the PrintHelper class works like a charm in a single window app, but in a multiple windows app, it doesn't work properly because it uses the DispatcherHelper.ExecuteOnUIThreadAsync which calls the main thread and the printing happens in a different thread.

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[Kyaa-dost]

@mabbond could you please add an image or clip of what you are seeing?

[mabbond]

@Kyaa-dost here is a screen shot of the app that I'm working on.

When I hit the print button it throws this error, because I try to invocate the printing dialog from the secondary screen it throws this error