TextBox clear button visible even when no text

[juusimaa]

Bug explanation

When TextBox visibility is initially set Collapsed and TextFieldAssist.HasClearButton = true and TextBox visibility changes to Visible, clear button is visible inside the TextBox even when there no text. See attached video.

<Window x:Class="TestingMaterialDesignXaml.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"
        Style="{StaticResource MaterialDesignWindow}">
        <StackPanel VerticalAlignment="Center">
            <TextBox x:Name="TextBox" 
                     materialDesign:TextFieldAssist.HasClearButton="True"
                     Width="200"
                     Margin="10"
                     Visibility="Collapsed"/>
            <Button Width="200"
                    Content="Hide/Show"
                    Click="ButtonBase_OnClick"/>
        </StackPanel>
</Window>

using System.Windows;

namespace TestingMaterialDesignXaml
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
        {
            TextBox.Visibility = TextBox.Visibility == Visibility.Collapsed ? Visibility.Visible : Visibility.Collapsed;
        }
    }
}

Recording.2025-09-04.133353.mp4

Version

5.2.1

[corvinsz]

@juusimaa thank you for your detailed bug report.
I looked into this, and it seems there is a bug with the hint (aka SmartHint).
If my PR merges, this bug will be fixed in the next (pre-)release. 😄