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A crash when opening some PDF files on the Android

Hej! 

I'm stuck with the critical issue.

Android.Util.AndroidRuntimeException: 'Only the original thread that created a view hierarchy can touch its views.'

When I'm trying to open some pdfs in our company-app. Unfortunately I'm not permitted to share company's pdfs, but I've spend some time trying to find other pdf that can cause an error. 


You can reproduce the error clicking on button with '5' in the attached Demo.