[HDPI] The form Icon for child form with maximize state in MDIParent form is very small when running on 300% DPI
- Dominant language
- C#
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Description
* .NET Core Version:
.NET SDK 6.0.100-preview.6.21313.2 + private binaries build from main branch in dotnet/winforms repo [Private dlls.zip](https://github.com/dotnet/winforms/files/6654328/Private.dlls.zip)
* Have you experienced this same bug with .NET Framework?:
No
**Problem description:**
The form Icon for child form with maximize state in MDIParent form is very small when running on 300% DPI.
**Expected behavior:**
The form Icon should like it works on 100% DPI.
**Minimal repro:**
1. Set the primary screen as 300% DPI, and second screenshot as 100% DPI.
2. Open and run the [TestApp5.zip](https://github.com/dotnet/winforms/files/6654367/TestApp5.zip) on the 300% primary screen.
3. Observe the form Icon for child form.
**More info:**
1. Can repro in 2 DPI modes: PerMonitorV2/SystemAware for MDI form's AutoScaleMode: Font/DPI.
2. Also repro in without privates.
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Assessment
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