Adjust window border style for blur themes and update border brush resource

Author: onesounds

Flow.Launcher.Core/Resource/Theme.cs

@@ -671,7 +671,15 @@ private void SetBlurForWindow(string theme, BackdropTypes backdropType)
                     windowBorderStyle.Setters.Remove(windowBorderStyle.Setters.OfType<Setter>().FirstOrDefault(x => x.Property.Name == "Background"));
                     windowBorderStyle.Setters.Add(new Setter(Border.BackgroundProperty, new SolidColorBrush(Colors.Transparent)));
                 }
-
+                
+                // For themes with blur enabled, the window border is rendered by the system, so it's treated as a simple rectangle regardless of thickness.
+                //(This is to avoid issues when the window is forcibly changed to a rectangular shape during snap scenarios.)
+                var cornerRadiusSetter = windowBorderStyle.Setters.OfType<Setter>().FirstOrDefault(x => x.Property == Border.CornerRadiusProperty);
+                if (cornerRadiusSetter != null)
+                    cornerRadiusSetter.Value = new CornerRadius(0);
+                else
+                    windowBorderStyle.Setters.Add(new Setter(Border.CornerRadiusProperty, new CornerRadius(0)));
+                
                 // Apply the blur effect
                 Win32Helper.DWMSetBackdropForWindow(mainWindow, backdropType);
                 ColorizeWindow(theme, backdropType);

Flow.Launcher/Themes/Win11Light.xaml

@@ -73,9 +73,8 @@
         BasedOn="{StaticResource BaseWindowBorderStyle}"
         TargetType="{x:Type Border}">
         <Setter Property="BorderThickness" Value="1" />
-        <Setter Property="BorderBrush" Value="{m:DynamicColor SystemControlBackgroundChromeMediumBrush}" />
+        <Setter Property="BorderBrush" Value="{DynamicResource SystemThemeBorder}" />
         <Setter Property="Background" Value="{DynamicResource Color01B}" />
-        <Setter Property="CornerRadius" Value="8" />
         <Setter Property="UseLayoutRounding" Value="True" />
     </Style>
     <Style