Fixed line break mode for buttons

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue19806.cs

@@ -0,0 +1,24 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue19806 : _IssuesUITest
+	{
+		public Issue19806(TestDevice device)
+			: base(device)
+		{ }
+
+		public override string Issue => "Button doesn't respect LineBreakMode";
+
+		[Test]
+		public void TextInButtonShouldBeTruncated()
+		{
+			App.WaitForElement("button");
+
+			//Text in the button should be truncated and fit within the frame
+			VerifyScreenshot();
+		}
+	}
+}

src/Controls/tests/TestCases/Issues/Issue19806.xaml

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Maui.Controls.Sample.Issues.Issue19806">
+    <ScrollView>
+        <VerticalStackLayout>
+        <Border Margin="8"
+                Padding="8"
+                Background="White"
+                StrokeShape="{RoundRectangle CornerRadius=4}"
+                Shadow="{Shadow Radius=4, Opacity=.4}">
+
+            <Grid Padding="8"
+                  ColumnDefinitions="*"
+                  RowSpacing="4"
+                  RowDefinitions="*,*,*">
+
+                <Label Grid.Row="0"
+                       Grid.Column="0"
+                       Text="Row 0: Hello, World!"
+                       SemanticProperties.HeadingLevel="Level1" />
+
+                <Label Grid.Row="1"
+                       Grid.Column="0"
+                       Text="Row 1: Welcome to .NET Multi-platform App UI"/>
+
+                <Button Grid.Row="2"
+                        Grid.Column="0"
+                        AutomationId="button"
+                        Text="Row 2: Why is this happening to this button in this context on this iOS simulator? This text should be truncated. This text should be truncated. This text should be truncated. This text should be truncated. This text should be truncated. This text should be truncated. This text should be truncated. This text should be truncated." 
+                        HorizontalOptions="Start"
+                        BorderWidth="1"
+                        BackgroundColor="White"
+                        TextColor="Purple"
+                        BorderColor="Purple"
+                        Padding="0"
+                        LineBreakMode="TailTruncation"/>
+            </Grid>
+        </Border>
+    </VerticalStackLayout>
+    </ScrollView>
+</ContentPage>

src/Controls/tests/TestCases/Issues/Issue19806.xaml.cs

@@ -0,0 +1,17 @@
+using System;
+using System.ComponentModel;
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Controls.Xaml;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[XamlCompilation(XamlCompilationOptions.Compile)]
+	[Issue(IssueTracker.Github, 19806, "Button doesn't respect LineBreakMode", PlatformAffected.All)]
+	public partial class Issue19806 : ContentPage
+	{
+		public Issue19806()
+		{
+			InitializeComponent();
+		}
+	}
+}

src/Core/src/Layouts/LayoutExtensions.cs

@@ -45,6 +45,11 @@ public static Rect ComputeFrame(this IView view, Rect bounds)
 			{
 				consumedWidth = Math.Min(bounds.Width, view.MaximumWidth);
 			}
+			else if (!IsExplicitSet(view.Width))
+			{
+				consumedWidth = Math.Min(bounds.Width, view.DesiredSize.Width);
+			}
+
 
 			// And the actual frame width needs to subtract the margins
 			var frameWidth = Math.Max(0, consumedWidth - margin.HorizontalThickness);
@@ -83,6 +88,11 @@ static double AlignHorizontal(IView view, Rect bounds, Thickness margin)
 				// If the width is not set, we use the minimum between the MaxWidth or the bound's width
 				desiredWidth = IsExplicitSet(view.Width) ? desiredWidth : Math.Min(bounds.Width, view.MaximumWidth);
 			}
+			else if (!IsExplicitSet(view.Width))
+			{
+				desiredWidth = Math.Min(bounds.Width, view.DesiredSize.Width);
+			}
+
 
 			return AlignHorizontal(bounds.X, margin.Left, margin.Right, bounds.Width, desiredWidth, alignment);
 		}