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Created attachment 17839 [details]
The attached VS project reproduces this bug
=== Overview ===
On UWP, using Xamarin.Forms, sometimes Grid layout seems to calculate row heights incorrectly. The problem symptoms include:
a) A grid row gets unusually high, containing white space.
b) Rows after the unusually high row get pushed down.
c) Sometimes the last rows get pushed beyond the grid/view clip rect and are only partially visible or not visible at all.
A tarball containing a reproducing project is attached.
This is potentially related to https://bugzilla.xamarin.com/show_bug.cgi?id=44302
=== Steps to Reproduce ===
Using the attached project:
1. Click ButtonA, which opens up a modal dialog.
2. Close modal dialog.
3. Observe the extra space that appeared between rows Foo 1 and Foo 2.
4. Click ButtonB, which hides it.
5. The extra space between rows Foo 1 and Foo 2 should disappear.
Note that the extra space appears only once. If you repeat the steps, the layout will no longer shift. To reproduce the problem, you need to restart the app.
In the actual application where we experience this, or a similar layout problem, the problem happens every time. In our case the problematic view is shown as the detail page of master/detail page. The workaround we are currently using is just to set HeightRequest on the row that gets the unstable vertical space.
=== Expected Behavior ===
Grid rows will maintain their vertical height.
=== Actual Behavior ===
Grid rows end up with extra vertical space even though there doesn't seem to be anything that particularly changes vertically in the layout.
=== Visual Studio===
Microsoft Visual Studio Community 2015
Version 14.0.25431.01 Update 3
Microsoft .NET Framework
Installed Version: Community
Visual Basic 2015 00322-20000-00000-AA752
Microsoft Visual Basic 2015
Visual C# 2015 00322-20000-00000-AA752
Microsoft Visual C# 2015
Visual C++ 2015 00322-20000-00000-AA752
Microsoft Visual C++ 2015
Windows Phone SDK 8.0 - ENU 00322-20000-00000-AA752
Windows Phone SDK 8.0 - ENU
Application Insights Tools for Visual Studio Package 7.8.00927.1
Application Insights Tools for Visual Studio
ASP.NET and Web Tools 2015.1 14.1.20810.0
ASP.NET and Web Tools 2015.1
ASP.NET Web Frameworks and Tools 2012.2 4.1.41102.0
For additional information, visit http://go.microsoft.com/fwlink/?LinkID=309563
ASP.NET Web Frameworks and Tools 2013 5.2.40314.0
For additional information, visit http://www.asp.net/
AWS Toolkit for Visual Studio 2015 188.8.131.52
AWS Toolkit for Visual Studio 2015.
Copyright 2011-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
This software includes third party software subject to the following copyrights:
- Logging from log4net, Apache License
- Putty for PPK to PEM conversion, MIT license
- NGit for AWS Elastic Beanstalk incremental push
- NSch dependency for NGit
- Sharpen dependency for NGit
- ICSharpCode.SharpZipLib dependency for NGit
- Mono.Posix.dll and Mono.Security.dll dependencies for NGit
- MPFProj for Visual Studio Project Framework
- JSON Checker for JSON validation
Azure App Service Tools v2.8.1 14.0.11123.0
Azure App Service Tools v2.8.1
Command Bus, Event Stream and Async Manager Merq
Provides ICommandBus, IEventStream and IAsyncManager MEF services for loosely coupled Visual Studio extension components communication and integration.
Common Azure Tools 1.8
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.
Microsoft .NET Core Tools (Preview 2) 14.1.20810.0
Microsoft .NET Core Tools (Preview 2)
Microsoft Azure Mobile Services Tools 1.4
Microsoft Azure Mobile Services Tools
NuGet Package Manager 3.5.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.
PreEmptive Analytics Visualizer 1.2
Microsoft Visual Studio extension to visualize aggregated summaries from the PreEmptive Analytics product.
SQL Server Data Tools 14.0.60519.0
Microsoft SQL Server Data Tools
TypeScript tools for Visual Studio
Visual Studio Tools for Universal Windows Apps 14.0.25527.01
The Visual Studio Tools for Universal Windows apps allow you to build a single universal app experience that can reach every device running Windows 10: phone, tablet, PC, and more. It includes the Microsoft Windows 10 Software Development Kit.
Xamarin 184.108.40.2065 (7603786)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android 220.127.116.11 (c1d1c79)
Visual Studio extension to enable development for Xamarin.Android.
Xamarin.iOS 10.0.0.1 (29910bb)
Visual Studio extension to enable development for Xamarin.iOS.
=== Operating System ===
OS Name Microsoft Windows 10 Home
Version 10.0.14393 Build 14393
*** This bug has been marked as a duplicate of bug 44302 ***