Added a setting to change the size of the interface (#1136)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/Tests/Settings/InterfaceScreenSizesTests.cs

@@ -0,0 +1,60 @@
+using AIStudio.Settings.DataModel;
+
+namespace AIStudio.Tests.Settings;
+
+/// <summary>
+/// Checks how the settings remember the interface size of each screen.
+/// </summary>
+/// <remarks>
+/// The list keeps the most recently set screen first and forgets the oldest beyond its limit, so that a
+/// user who meets many screens, e.g., at changing desks, does not grow the settings without end.
+/// </remarks>
+[TestFixture]
+public sealed class InterfaceScreenSizesTests
+{
+    private const string LAPTOP = "1920x1200@287x179mm";
+    private const string MONITOR = "3840x2160@597x336mm";
+
+    [Test]
+    public void AScreenTheUserChoseNothingForHasNoSize() => Assert.That(new DataApp().GetInterfaceScreenSize(LAPTOP), Is.Null);
+
+    [Test]
+    public void TheMostRecentlySetScreenComesFirst()
+    {
+        var app = new DataApp();
+        app.RememberInterfaceScreenSize(new(LAPTOP, InterfaceSize.APP_DEFAULT, null));
+        app.RememberInterfaceScreenSize(new(MONITOR, InterfaceSize.CUSTOM, 150));
+
+        Assert.That(app.InterfaceScreenSizes.Select(screen => screen.ScreenKey), Is.EqualTo(new[] { MONITOR, LAPTOP }));
+    }
+
+    [Test]
+    public void SettingAScreenAgainReplacesItsSizeAndMovesItToTheFront()
+    {
+        var app = new DataApp();
+        app.RememberInterfaceScreenSize(new(LAPTOP, InterfaceSize.CUSTOM, 120));
+        app.RememberInterfaceScreenSize(new(MONITOR, InterfaceSize.SYSTEM_SCALING, null));
+        app.RememberInterfaceScreenSize(new(LAPTOP, InterfaceSize.SYSTEM_SCALING, 120));
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(app.InterfaceScreenSizes.Select(screen => screen.ScreenKey), Is.EqualTo(new[] { LAPTOP, MONITOR }));
+            Assert.That(app.GetInterfaceScreenSize(LAPTOP), Is.EqualTo(new InterfaceScreenSize(LAPTOP, InterfaceSize.SYSTEM_SCALING, 120)));
+        });
+    }
+
+    [Test]
+    public void BeyondTheLimitTheScreenSetTheLongestTimeAgoIsForgotten()
+    {
+        var app = new DataApp();
+        for (var screen = 0; screen <= DataApp.MAX_REMEMBERED_INTERFACE_SCREENS; screen++)
+            app.RememberInterfaceScreenSize(new($"{screen}x1080", InterfaceSize.CUSTOM, 100));
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(app.InterfaceScreenSizes, Has.Count.EqualTo(DataApp.MAX_REMEMBERED_INTERFACE_SCREENS));
+            Assert.That(app.GetInterfaceScreenSize("0x1080"), Is.Null);
+            Assert.That(app.GetInterfaceScreenSize("1x1080"), Is.Not.Null);
+        });
+    }
+}