Handle no previous measure/arrange.

This shouldn't happen, but if it does, don't crash.
9 years ago · ab30fd343b
1 changed files with 2 additions and 2 deletions
--- a/src/Avalonia.Layout/LayoutManager.cs
+++ b/src/Avalonia.Layout/LayoutManager.cs
@ -165,7 +165,7 @@ namespace Avalonia.Layout
                {
                    root.Measure(Size.Infinity);
                }
-                else
+                else if (control.PreviousMeasure.HasValue)
                {
                    control.Measure(control.PreviousMeasure.Value);
                }
@ -185,7 +185,7 @@ namespace Avalonia.Layout
                {
                    root.Arrange(new Rect(control.DesiredSize));
                }
-                else
+                else if (control.PreviousArrange.HasValue)
                {
                    control.Arrange(control.PreviousArrange.Value);
                }