TextBox TextWrapping.Wrap inside Grid with IsSharedSizeScope

[n9]

Description

TextBox TextWrapping=Wrap does not work when contained in Grid within SharedSizeScope.

Reproduction Steps

var sharedSizeGroup = "foo";

Grid CreateGrid()
{
	var g = new Grid();
	g.ColumnDefinitions.Add(new()
	{
		SharedSizeGroup = sharedSizeGroup
	});
	g.Children.Add(new TextBox
	{
		Text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.",
		TextWrapping = TextWrapping.Wrap
	});
	return g;
}

var stack = new StackPanel
{
	Orientation = Orientation.Vertical
};

Grid.SetIsSharedSizeScope(stack, true); // <-- the text will wrap when this line is removed

stack.Children.Add(CreateGrid());
stack.Children.Add(CreateGrid());

new Window
{
	Width = 400,
	Height = 300,
	Content = stack,
}.Show();

Expected behavior

TextWrapping.Wrap will work.

Actual behavior

TextWrapping.Wrap is not working.

Regression?

Seems not.

Known Workarounds

I am not aware of any.

Impact

Cannot use both IsSharedSizeScope and TextWrapping.Wrap. Cannot create multiple field lists where text is wrapped.

Configuration

.NET 9.0.1

Other information

No response

[miloush]

That seems by design.

IsSharedScope says:

Columns and rows participating in size sharing do not respect Star sizing. In this scenario, Star sizing is treated as Auto.

Where Star is sized to available space, while Auto is sized to content, as documented here

[n9]

@miloush Ok, thank you for the explanation. Do you know why this limitation exists? Is it a limitation of how WPF layout (measure/arrange) works, so it is "impossible" to share size between grids? Or is it just a limitation of the current implementation of Grid, but it can be "easily" improved to support Star sizing within size sharing?

[miloush]

I think it gets a bit more complicated, star represents potentially different value in each grid. The grids don't have to have the same width for example. If you had two grids with two columns, one of them shared size, but the grids were of different size. What would you expect the shared size to be? Half of the smaller grid, half of the larger grid, or actually different width in each grid? Sizing to content gives you an absolute number that can be shared across several grids.

[n9]

@miloush Ok, column/row size sharing is not a suitable concept for my use case.