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The speed of mouse wheel scrolling in the iOS designer is extremely slow compared to most windows programs. It seems to move about 5-6 pixels with each tick, compared to, e.g. 100 pixels for Chrome.
In most applications, a full mouse wheel swipe starting from the last knuckle on my finger will scroll about a page worth. In Visual Studio iOS designer, it takes ~17 swipes to get the same effect.
I have checked this issue with latest master build of Xamarin.VisualStudio_220.127.116.1168 and observed that this issue is fixed. It take ~3 swipes to scroll the full zoomed iOS designer in Visual Studio.
Microsoft Visual Studio Professional 2013
Version 12.0.40629.00 Update 5
Microsoft .NET Framework
Xamarin 18.104.22.16868 (5194a36)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android 22.214.171.124 (2aacf0e)
Visual Studio extension to enable development for Xamarin.Android.
Xamarin.iOS 126.96.36.199 (d747998)
Visual Studio extension to enable development for Xamarin.iOS.
As per milestone mentioned in the bug Please merge this fix in Cycle 8 Service Release 1 branch as well, so that we may proceed and close this issue after verifying on the same.
As per comment 3, this issue is working fine with master build. So I am closing this issue marking its stats as VERIFIED.