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Created attachment 24508 [details]
Clone and build the Acquaint sample app: https://github.com/xamarinhq/app-acquaint
For the Debug build, changing the Linking from "Sdk Assemblies Only" to None. That's needed to work around another bug (https://bugzilla.xamarin.com/show_bug.cgi?id=59115)
Open the Previewer on the AcquaintanceEdtPage.xaml
Then open AcquaintanceDetailPage.xaml
Result: You the "An exception occurred while rendering the control" message, with the exclamation icon on the right. The "Something went wrong / Connection is closed" message is in the body of the preview window. That's all as expected--there's an error.
But the bug here is that if you click on the red exclamation mark icon, that normally pops up the exception dialog, nothing happens. I think it's more of the previewer getting into a bad state (very quickly) rather than this particular page's error, that causes that. In some other scenarios the exception popup for this page does work.
See also https://bugzilla.xamarin.com/show_bug.cgi?id=59162, which is another bug for the same scenario.
All of the exceptions which are related to this error are from the depths of forms itself and not related to the previewer itself. It will probably require change to xamarin.forms or xamarin.android to address.
*** Bug 59162 has been marked as a duplicate of this bug. ***
OK, but note that the bug here isn't that there are exceptions, it's that the exception popup is broken.
Sometimes I see the exception popup show, with scrollbars.
Then if I click it again, I'll see it show up--for exactly the same exception--but with no scroll bars (they disappear).
And sometimes I see it not show up at all, like here.
It seems intermittent, but happens a lot. UI resource issue?
I feel like we can duplicate this one against 59056 because it's talking about the same issue.
The onyl additional request from the other bug was to make the window resizeable, so i'll mention that here.
*** Bug 59056 has been marked as a duplicate of this bug. ***
*** Bug 59707 has been marked as a duplicate of this bug. ***