Limit InlineUIContainer to available width

src/Avalonia.Controls/Documents/Inline.cs

@@ -66,7 +66,7 @@ public static void SetTextDecorations(Control control, TextDecorationCollection?
             control.SetValue(TextDecorationsProperty, value);
         }
 
-        internal abstract void BuildTextRun(IList<TextRun> textRuns);
+        internal abstract void BuildTextRun(IList<TextRun> textRuns, Size blockSize);
 
         internal abstract void AppendText(StringBuilder stringBuilder);
 

src/Avalonia.Controls/Documents/InlineUIContainer.cs

@@ -18,6 +18,8 @@ public class InlineUIContainer : Inline
         public static readonly StyledProperty<Control> ChildProperty =
             AvaloniaProperty.Register<InlineUIContainer, Control>(nameof(Child));
 
+        private double _measuredWidth = double.NaN;
+
         /// <summary>
         /// Initializes a new instance of InlineUIContainer element.
         /// </summary>
@@ -51,11 +53,12 @@ public Control Child
             set => SetValue(ChildProperty, value);
         }
 
-        internal override void BuildTextRun(IList<TextRun> textRuns)
+        internal override void BuildTextRun(IList<TextRun> textRuns, Size blockSize)
         {
-            if(!Child.IsMeasureValid)
+            if (_measuredWidth != blockSize.Width || !Child.IsMeasureValid)
             {
-                Child.Measure(Size.Infinity);
+                Child.Measure(new Size(blockSize.Width, double.PositiveInfinity));
+                _measuredWidth = blockSize.Width;
             }
 
             textRuns.Add(new EmbeddedControlRun(Child, CreateTextRunProperties()));

src/Avalonia.Controls/Documents/LineBreak.cs

@@ -19,7 +19,7 @@ public LineBreak()
         {
         }
 
-        internal override void BuildTextRun(IList<TextRun> textRuns)
+        internal override void BuildTextRun(IList<TextRun> textRuns, Size blockSize)
         {
             var text = Environment.NewLine;
 

src/Avalonia.Controls/Documents/Run.cs

@@ -50,7 +50,7 @@ public string? Text {
             set => SetValue(TextProperty, value);
         }
 
-        internal override void BuildTextRun(IList<TextRun> textRuns)
+        internal override void BuildTextRun(IList<TextRun> textRuns, Size blockSize)
         {
             var text = Text ?? "";
 
@@ -59,7 +59,7 @@ internal override void BuildTextRun(IList<TextRun> textRuns)
                 return;
             }
 
-            var textRunProperties = CreateTextRunProperties();           
+            var textRunProperties = CreateTextRunProperties();
 
             var textCharacters = new TextCharacters(text, textRunProperties);
 

src/Avalonia.Controls/Documents/Span.cs

@@ -38,11 +38,11 @@ public InlineCollection Inlines
             set => SetValue(InlinesProperty, value);
         }
 
-        internal override void BuildTextRun(IList<TextRun> textRuns)
+        internal override void BuildTextRun(IList<TextRun> textRuns, Size blockSize)
         {
             foreach (var inline in Inlines)
             {
-                inline.BuildTextRun(textRuns);
+                inline.BuildTextRun(textRuns, blockSize);
             }
         }
 

src/Avalonia.Controls/TextBlock.cs

@@ -730,7 +730,7 @@ protected override Size MeasureOverride(Size availableSize)
                 _textLayout = null;
                 _constraint = deflatedSize;
 
-                //Force arrange so text will be properly alligned.
+                //Force arrange so text will be properly aligned.
                 InvalidateArrange();
             }
 
@@ -742,7 +742,7 @@ protected override Size MeasureOverride(Size availableSize)
 
                 foreach (var inline in inlines!)
                 {
-                    inline.BuildTextRun(textRuns);
+                    inline.BuildTextRun(textRuns, deflatedSize);
                 }
 
                 _textRuns = textRuns;

tests/Avalonia.Controls.UnitTests/TextBlockTests.cs

@@ -348,7 +348,7 @@ public void Changing_Inlines_Should_Reset_InlineUIContainer_VisualParent_On_Meas
         }
 
         [Fact]
-        public void InlineUIContainer_Child_Schould_Be_Arranged()
+        public void InlineUIContainer_Child_Should_Be_Arranged()
         {
             using (UnitTestApplication.Start(TestServices.StyledWindow))
             {
@@ -382,6 +382,31 @@ public void InlineUIContainer_Child_Schould_Be_Arranged()
             }
         }
 
+        [Fact]
+        public void InlineUIContainer_Child_Should_Be_Constrained()
+        {
+            using (UnitTestApplication.Start(TestServices.StyledWindow))
+            {
+                var target = new TextBlock();
+
+                GeometryDrawing drawing = new GeometryDrawing();
+                drawing.Geometry = new RectangleGeometry(new Rect(0, 0, 500, 500));
+                DrawingImage image = new DrawingImage(drawing);
+
+                Image imageControl = new Image { Source = image };
+                InlineUIContainer container = new InlineUIContainer(imageControl);
+
+                target.Inlines.Add(new Run("The child should not be limited by position on line."));
+                target.Inlines.Add(container);
+
+                target.Measure(new Size(100, 100));
+                target.Arrange(new Rect(target.DesiredSize));
+
+                Assert.True(imageControl.IsMeasureValid);
+                Assert.Equal(100, imageControl.Bounds.Width);
+            }
+        }
+
         [Fact]
         public void Setting_Text_Should_Reset_Inlines()
         {