Items disappear from the ListView when the user scrolls up/down

.NET Core Version:

• 3.0

Have you experienced this same bug with .NET Framework?:

• No

Repro steps:

1. Create a ListView in virtual mode with 1 million items (or use NET5 project from VirtualListView.zip).
2. Add Application.SetHighDpiMode(HighDpiMode.SystemAware) line to Program.cs
3. Start scrolling up/down

Actual behavior: Items disappear:

Expected behavior: Items should be displayed

[dreddy-work]

Thanks @kirsan31 for the details. Removed regression tag and slated for next release.

[kirsan31]

All a bit more complicated ( or simple )?

1. Another prerequisite for reproduction is that the system’s DPI should be more than 100. On 100% DPI all work fine.
2. If your make net4 app DPI aware:

<System.Windows.Forms.ApplicationConfigurationSection>
  <add key="DpiAwareness" value="true" />
</System.Windows.Forms.ApplicationConfigurationSection>

and change font of the app to system font like this:

public Form1()
{
	Font = SystemFonts.MessageBoxFont;
	InitializeComponent();
...
}

then this issue will repro even on net472:

https://user-images.githubusercontent.com/17767561/128871299-b3201c0a-19cb-4f48-9534-8c3cc9096a4d.mp4

So, strictly speaking this is not a regression, this is DPI scaling problem that exist even in net framework, but become more easy discoverable in .Net due to default font change.

@dreddy-work your can safely add this to area: HDPI 😉