From 7802d00c127ca28327b07a1d452aba313c6facd8 Mon Sep 17 00:00:00 2001
From: John Stewien <stewienj@users.noreply.github.com>
Date: Thu, 17 Aug 2017 16:23:36 +0930
Subject: [PATCH] AvalonDock fixed crash when shrinking auto-sized panel

---
 .../Controls/LayoutGridControl.cs                | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutGridControl.cs b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutGridControl.cs
index c4fc3bfa..94d4f831 100644
--- a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutGridControl.cs
+++ b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutGridControl.cs
@@ -386,6 +386,10 @@ namespace Xceed.Wpf.AvalonDock.Controls
                 {
                     prevChildModel.DockWidth = new GridLength(prevChildModel.DockWidth.Value * (prevChildActualSize.Width + delta) / prevChildActualSize.Width, GridUnitType.Star);
                 }
+                else if (prevChildModel.DockWidth.IsAuto)
+                {
+                    prevChildModel.DockWidth = new GridLength(prevChildActualSize.Width + delta, GridUnitType.Pixel);
+                }
                 else
                 {
                     prevChildModel.DockWidth = new GridLength(prevChildModel.DockWidth.Value + delta, GridUnitType.Pixel);
@@ -395,6 +399,10 @@ namespace Xceed.Wpf.AvalonDock.Controls
                 {
                     nextChildModel.DockWidth = new GridLength(nextChildModel.DockWidth.Value * (nextChildActualSize.Width - delta) / nextChildActualSize.Width, GridUnitType.Star);
                 }
+                else if (nextChildModel.DockWidth.IsAuto)
+                {
+                    nextChildModel.DockWidth = new GridLength(nextChildActualSize.Width - delta, GridUnitType.Pixel);
+                }
                 else
                 {
                     nextChildModel.DockWidth = new GridLength(nextChildModel.DockWidth.Value - delta, GridUnitType.Pixel);
@@ -406,6 +414,10 @@ namespace Xceed.Wpf.AvalonDock.Controls
                 {
                     prevChildModel.DockHeight = new GridLength(prevChildModel.DockHeight.Value * (prevChildActualSize.Height + delta) / prevChildActualSize.Height, GridUnitType.Star);
                 }
+                else if (prevChildModel.DockHeight.IsAuto)
+                {
+                    prevChildModel.DockHeight = new GridLength(prevChildActualSize.Height + delta, GridUnitType.Pixel);
+                }
                 else
                 {
                     prevChildModel.DockHeight = new GridLength(prevChildModel.DockHeight.Value + delta, GridUnitType.Pixel);
@@ -415,6 +427,10 @@ namespace Xceed.Wpf.AvalonDock.Controls
                 {
                     nextChildModel.DockHeight = new GridLength(nextChildModel.DockHeight.Value * (nextChildActualSize.Height - delta) / nextChildActualSize.Height, GridUnitType.Star);
                 }
+                else if (nextChildModel.DockHeight.IsAuto)
+                {
+                    nextChildModel.DockHeight = new GridLength(nextChildActualSize.Height - delta, GridUnitType.Pixel);
+                }
                 else
                 {
                     nextChildModel.DockHeight = new GridLength(nextChildModel.DockHeight.Value - delta, GridUnitType.Pixel);