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Browsing the Android WebViewRenderer source over the weekend I noticed that in OnElementChanged the code doesn't unhook the various events properly:
if (e.OldElement != null)
e.OldElement.EvalRequested -= new EventHandler...
e.NewElement.GoBackRequested -= new EventHandler...
e.NewElement.GoForwardRequested -= new EventHandler...
Unless I've missed something fundamental, the two lines with e.NewElement should read e.OldElement instead.
I have tried to reproduce this issue with provided code in bug description and not able to reproduce it.
Could you please provide us sample project? so that we can reproduce it at our end.
Xamarin Studio 5.9.5 (build 9)
Installation UUID: 1a096c6f-0678-402e-89b2-a2c10f7e80e4
Mono 4.0.4 ((detached/5ab4c0d)
GTK+ 2.24.23 (Raleigh theme)
Package version: 400040001
Xcode 6.2 (6776)
Xamarin.iOS : 126.96.36.199 (Enterprise Edition)
Xamarin.Android : 188.8.131.52 (Enterprise Edition)
Mac OS X 10.9.4
It's not my code - it's the code in the Android WebViewRenderer in the Xamarin.Forms library.
It's possible that 1.5.0-pre3 has already fixed the problem, but it's definitely there in the version I'm using (1.4.4, as noted in the bug report settings).
Should be fixed in 1.5.2-pre1