Xamarin.forms: [Bug] Can't click Button in Xamarin.UWP for cursor offset exist

[evolcano]

Description

After upgrade Xamarin Git package, Cursor of Xamarin.UWP APP runs in Windows 10 react improperly. You just cann't click Button even the cursor is just above the Button. The Button is in ScrollView.

Steps to Reproduce

1. Before scroll, everything is OK. The color of Button changed to bright gray when Cursor hover over, and can click
   

2. After scroll, the Button don't response to the hover of cursor, and can not click
   

3. If you move the cursor lower to some extent，the Button response to the hover of cursor, and click is vaild
   

_Obvirouly, the offset exist._

Expected Behavior

Button response to cursor.

Actual Behavior

Button do not response to cursor properly.

Basic Information

• Version with issue:
• visual studio 16.6.2
• Xamarin.Forms Version="4.7.0.968"
• netstandard 2.0
• TargetPlatformVersion:10.0.18362.0 - 10.0.17134.0
• Affected Devices: window 10

Screenshots

Reproduction Link

Example code:
examplecode.txt

Workaround

[samhouts]

perhaps related to https://github.com/xamarin/Xamarin.Forms/issues/11106

[rmarinho]

Hum, something weird here, i can't reproduce, can you take a look at this sample @evolcano see what i m missing.

Thanks

Issue11106_11174.zip

[evolcano]

Hi, @rmarinho
Thank you!
Issue11106_11174.zip is fine on my computer. The only difference which I could found is the TargetPlatformVersion of UWP Project:
1.Issue11106_11174

2. My example project

According to #11106 which samhouts mentioned before, maybe Windows 10, version 1903 (10.0; Build 18362) cause the error due to ScrollView. But the scroller is OK just one week before.

ps: my test solution

App21.zip

[MagicAndre1981]

I also can't click buttons in UWP. Eventhandler is not fired at all as breakpoint is not hit.

I use NavigationPage, no Shell and have a Grid Layout inside a ScrollView. On a different page without ScrollView, the click event is fired and clickedhandler is called.

MinVersion: 16299/Target: 19041, XF 4.6 SR4 worked, upgraded to 4.7 and it is broken.

[evolcano]

@MagicAndre1981 It turns out like after upgrade Xamarin, as long as you use a ScrollView and scrolled, the Y coordinate of Cursor is mis-culculated, The offset maybe relate to ScrollView scrolled.

[rmarinho]

Thanks we identified the issue and working for a fix ASAP

[MagicAndre1981]

for me it works with 4.7 SR1

[samhouts]

closed by #11207