GridSplitter - Fixed issue where the grid would overflow when resizing columns with minimum width

Microsoft.Toolkit.Uwp.UI.Controls/GridSplitter/GridSplitter.Events.cs

@@ -2,6 +2,8 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System.Collections.Generic;
+using System.Linq;
 using Windows.System;
 using Windows.UI.Core;
 using Windows.UI.Xaml;
@@ -239,9 +241,17 @@ private bool HorizontalMove(double horizontalChange)
                 return true;
             }
 
+            var columnsWithAutomaticWidth = Resizable.ColumnDefinitions.Where(x => (x.Width.IsStar || x.Width.IsAuto) && x != CurrentColumn);
+
             // if current column has fixed width then resize it
             if (!IsStarColumn(CurrentColumn))
             {
+                // Check if all automatic width columns will respect min and max width after resize
+                if (!AreValidColumnWidths(columnsWithAutomaticWidth, horizontalChange * -1))
+                {
+                    return false;
+                }
+
                 // No need to check for the Column Min width because it is automatically respected
                 if (!SetColumnWidth(CurrentColumn, horizontalChange, GridUnitType.Pixel))
                 {
@@ -258,6 +268,15 @@ private bool HorizontalMove(double horizontalChange)
                     return false;
                 }
 
+                // Remove the Sibling as it will be checked during resize
+                columnsWithAutomaticWidth = columnsWithAutomaticWidth.Where(x => x != SiblingColumn);
+
+                // Check if all automatic width columns will respect min and max width after resize
+                if (!AreValidColumnWidths(columnsWithAutomaticWidth, horizontalChange))
+                {
+                    return false;
+                }
+
                 if (!SetColumnWidth(SiblingColumn, horizontalChange * -1, GridUnitType.Pixel))
                 {
                     return true;
@@ -297,5 +316,18 @@ private bool HorizontalMove(double horizontalChange)
 
             return false;
         }
+
+        private bool AreValidColumnWidths(IEnumerable<ColumnDefinition> columns, double horizontalChange)
+        {
+            foreach (var column in columns)
+            {
+                if (!IsValidColumnWidth(column, horizontalChange))
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
     }
 }