Merge pull request #8574 from AvaloniaUI/fixes/win32-consistent-minimize-restore-window-size

Win32: Retain window position and size when docked and then minimized and restored.

src/Windows/Avalonia.Win32/WindowImpl.cs

@@ -285,11 +285,12 @@ namespace Avalonia.Win32
 
             set
             {
-                if (IsWindowVisible(_hwnd))
+                if (IsWindowVisible(_hwnd) && _lastWindowState != value)
                 {
                     ShowWindow(value, value != WindowState.Minimized); // If the window is minimized, it shouldn't be activated
                 }
 
+                _lastWindowState = value;
                 _showWindowState = value;
             }
         }

tests/Avalonia.IntegrationTests.Appium/WindowTests.cs

@@ -1,7 +1,9 @@
 using System;
+using System.Linq;
 using System.Runtime.InteropServices;
 using System.Threading;
 using Avalonia.Controls;
+using OpenQA.Selenium;
 using OpenQA.Selenium.Appium;
 using OpenQA.Selenium.Interactions;
 using Xunit;
@@ -55,6 +57,43 @@ namespace Avalonia.IntegrationTests.Appium
                 }
             }
         }
+        
+        [PlatformFact(TestPlatforms.Windows)]
+        public void OnWindows_Docked_Windows_Retain_Size_Position_When_Restored()
+        {
+            using (OpenWindow(new Size(400, 400), ShowWindowMode.NonOwned, WindowStartupLocation.Manual))
+            {
+                var windowState = _session.FindElementByAccessibilityId("WindowState");
+
+                Assert.Equal("Normal", windowState.GetComboBoxValue());
+                
+                
+                var window = _session.FindElements(By.XPath("//Window")).First();
+                
+                new Actions(_session)
+                    .KeyDown(Keys.Meta)
+                    .SendKeys(Keys.Left)
+                    .KeyUp(Keys.Meta)
+                    .Perform();
+                
+                var original = GetWindowInfo();
+                
+                windowState.Click();
+                _session.FindElementByName("Minimized").SendClick();
+                
+                new Actions(_session)
+                    .KeyDown(Keys.Alt)
+                    .SendKeys(Keys.Tab)
+                    .KeyUp(Keys.Alt)
+                    .Perform();
+                
+                var current = GetWindowInfo();
+                
+                Assert.Equal(original.Position, current.Position);
+                Assert.Equal(original.FrameSize, current.FrameSize);
+
+            }
+        }
 
 
         [Theory]