WindowWatcher.UpdateFocus assertion failure on ExcelDNA.Intellisense 1.1.0

[wh1t3cAt1k]

@govert I wonder if this assertion needs to be deleted.

The reproduction steps are in this video:

https://www.screencast.com/t/PQ2OjPe80KV

[wh1t3cAt1k]

Or maybe at least allow the situation where windowClassName is empty.

[govert]

@wh1t3cAt1k I've had a quick first look at this. I can recreate the problem you show, so that helps a lot - thank you!

The problem is a bit bigger then just taking out the assertion - it really does indicate a problem with the focus tracking I'm trying to do - in one case the window I am trying to set the focus has already been destroyed (behind me back).
I will have to be a bit more careful in fixing this . . .