[Bug] .IsVisible Render Issue

[ColdstarJoey]

Description

when having a element (frame) in a ScrollView when I scroll to the bottom and hit a checkbox to turn off that frame (Name.IsVisible = false) it hides it as normal but when re adding the frame but when unticking the checkbox it only renders what the screen can see. when reverting back to Forms 4.8 it works perfectly.

Steps to Reproduce

1. have a frame or element in a ScrollView near the bottom of the page
2. use a checkbox to make visibility change
3. when it actives it only shows the added part of the frame not the full frame and content unless you tap on it

[hartez]

@ColdstarJoey Which platform are you seeing this behavior on?

[ColdstarJoey]

@ColdstarJoey Which platform are you seeing this behavior on?

Hi the platform was Android and the device was a new Samsung Tab A

[Tommigun1980]

Could this be related to or the same bug as #13203 and #13126 (comment)?

[oscarjaergren]

I have the same error! Does anyone have a workaround?

[oscarjaergren]

Workaround for me is to wrap the ScrollView around a StackLayout or other control.
The error only happens if ScrollView is the root content of the page.

[rmarinho]

Hi @ColdstarJoey can you please upload a small reproduction? having troubles to reproduce it myself.

thanks

[luccasclezar]

Here it is :)

This issue may be the same as #12567 and #13418 by the way, and if it is, it could probably already be fixed by #13640, but I tested with Xamarin.Forms 5.0.1.2008-nightly and the issue is still there.

LayoutTest.zip

[LGFox]

I have this problem too. ScrollView is a root element on every page of my app. :-)
I have Xamarin.Forms 5.0.0.2012 and I'll downgrade to 4.8.0.1821

However, @oscarjaergren, your workaround works!

[rmarinho]

Can confirm it still fails on s 5.0.0.2012

[manojkulkarni30]

I was having the same problem, but the workaround provided by @oscarjaergren worked for me.

Xamarin Forms Version: 5.0.0.2012

[djhango]

Workaround provided by @oscarjaergren worked, although I ran into issues with VeritcalLayoutOptions not being applied correctly to items within the nested ScrollView. Wrapped it within a ContentView instead seems to work okay for my purposes

[thisismyself]

Might that be related to #13597 ? There, the workaround is also to add a ContentView around the ScrollView.

[holecekp]

I have the same problem. Is a fix for this planned soon? This bug causes some controls in my app to be outside the visible area of the screen (when they become visible by setting IsVisible=true).

[jfversluis]

@holecekp and others, I see people suspecting this might be linked to #15067 as well? Would you be able to verify that?