Fix grid not getting invalidated when changing the Height/Width of Row/ColumnDefinitions declared with the short syntax

[OvrBtn]

Description of Change

Issues Fixed

Fixes #25983

After change

2024-11-22.05-21-30.mp4

[OvrBtn]

Ooops last time I checked no one was assigned to the issue... sorry @sheiksyedm

[jsuarezruiz]

Could include an UITest?

[OvrBtn]

@jsuarezruiz is this alright? If yes I'd need screenshots from CI

[mattleibow]

Might not need a uitest, could be a unit test. I wonder if some of the existing test check for the update and can be copied for this scenario.

[OvrBtn]

@mattleibow I guess I could do something similar to this but additionaly change row/column size with grid.RowDefinitions[0].Height

maui/src/Core/tests/UnitTests/Layouts/GridLayoutManagerTests.cs

Lines 207 to 229 in 9416968

	public void TwoAbsoluteColumnsOneAbsoluteRow()
	{
	var grid = CreateGridLayout(columns: "100, 100", rows: "10");
	var viewSize = new Size(10, 10);
	var view0 = CreateTestView(viewSize);
	var view1 = CreateTestView(viewSize);
	SubstituteChildren(grid, view0, view1);
	SetLocation(grid, view0);
	SetLocation(grid, view1, col: 1);
	// Assuming no constraints on space
	MeasureAndArrangeAuto(grid);
	// Column width is 100, viewSize is less than that, so it should be able to layout out at full size
	AssertArranged(view0, 0, 0, 100, 10);
	// Since the first column is 100 wide, we expect the view in the second column to start at x = 100
	AssertArranged(view1, 100, 0, 100, 10);
	}