Grid isn't calculating row height correctly in some cases when RowSpan is used
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- C#
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Description
* .NET Core Version: All
* Windows version: 11
* Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes
The following XAML:
```xaml
```
should render two rows, each with height of 100 because each element has a height of 100, with exception of the one that spans 2 rows, which has a height of 200.
However, the result is the following:
The second row is exactly 1.5 times the height it should be.
**Expected behavior:**
If we insert the following:
```xaml
```
Then the grid is rendered as expected.
An interesting observation is that if we set explicit width for the first column, which in my example has 1* width, then the problem disappears.
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