Copy To Clipboard

[crossrulz]

On the LabVIEW Discord, RedHawk reported a bug with where "Clipboard" was being added to the pasted images. I found this problem and the solution is to not show the label on the Clipboard front panel control. But then I went digging.

The Clipboard control reference is stored in the References cluster that is part of the global data. But this reference is used in 1 VI: Export_Clipboard.vi. This VI is only called in the MenuSelection(User).vi, once for "Copy" and again for "Paste".

Because of this, I was thinking of removing the reference from the References cluster and use another method to get the clipboard reference. I came up with 2 possible solutions:

1. Pass the Clipboard control reference directly into the MenuSelection(User).vi and then into Export_Clipboard.vi.
2. Move the Clipboard control off of the lv_icon.vi and to the Export_Clipboard.vi, and only use the direct reference to that control or implicitly link the methods to the control.

I lean towards the later because it would make things more cohesive. The only drawback I can immediately come up with is that this would force the front panel of this VI to be loaded.

Thoughts? @dnattinger

[dnattinger]

I think solution 2 is fine. I don't see a disadvantage to loading the front panel of the Export_Clipboard.vi.

[crossrulz]

It turns out that I would need to explicitly open the front panel and then close it. In a small test VI, I think I was also running into a race condition between the image being exported to the clipboard and the panel closing despite the error wire dictating order. I ended up going with option 1.

[crossrulz]

Implemented with #291