From bf2553d37cc48043748f43fd46cc48794c17f16c Mon Sep 17 00:00:00 2001
From: TuringLambdaAI <jirentianxiang1024@gmail.com>
Date: Tue, 20 Oct 2026 18:26:52 +0800
Subject: [PATCH] fix(windows): suppress native TextBox underline in quick-add
 card

---
 windows/MainWindow.xaml | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/windows/MainWindow.xaml b/windows/MainWindow.xaml
index eca5d31..3a39d2f 100644
--- a/windows/MainWindow.xaml
+++ b/windows/MainWindow.xaml
@@ -376,7 +376,16 @@
                                     KeyDown="OnNewTaskKeyDown"
                                     TextChanged="OnNewTaskTextChanged"
                                     GotFocus="OnNewTaskFocusChanged"
-                                    LostFocus="OnNewTaskFocusChanged" />
+                                    LostFocus="OnNewTaskFocusChanged">
+                                    <!-- The surrounding QuickAddCard owns the input border.
+                                         WinUI's stock TextBox focused underline must not
+                                         draw a second blue rule along this card's bottom. -->
+                                    <TextBox.Resources>
+                                        <SolidColorBrush x:Key="TextControlBorderBrush" Color="Transparent" />
+                                        <SolidColorBrush x:Key="TextControlBorderBrushPointerOver" Color="Transparent" />
+                                        <SolidColorBrush x:Key="TextControlBorderBrushFocused" Color="Transparent" />
+                                    </TextBox.Resources>
+                                </TextBox>
                                 <Border
                                     x:Name="QuickAddPreview"
                                     Grid.Column="2"