Fix title aligment issue when subtitle is empty.

Wox/ResultPanel.xaml

@@ -37,11 +37,11 @@
                         </Image>
                         <Grid Margin="5 0 5 0" Grid.Column="1">
                             <Grid.RowDefinitions>
-                                <RowDefinition Height="*"></RowDefinition>
+                                <RowDefinition></RowDefinition>
-                                <RowDefinition x:Name="SubTitleRowDefinition"></RowDefinition>
+                                <RowDefinition Height="Auto" x:Name="SubTitleRowDefinition"></RowDefinition>
                             </Grid.RowDefinitions>
                             <TextBlock Style="{DynamicResource ItemTitleStyle}" VerticalAlignment="Center" x:Name="tbTitle" Text="{Binding Title}"></TextBlock>
-                            <TextBlock Style="{DynamicResource ItemSubTitleStyle}" Grid.Row="1" x:Name="tbSubTitle" Text="{Binding SubTitle}"></TextBlock>
+                            <TextBlock Style="{DynamicResource ItemSubTitleStyle}" Visibility="{Binding SubTitle, Converter={wox:StringNullOrEmptyToVisibilityConverter}}" Grid.Row="1" x:Name="tbSubTitle" Text="{Binding SubTitle}"></TextBlock>
                         </Grid>
                     </Grid>
                 </DataTemplate>

Wox/StringNullOrEmptyToVisibilityConverter.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+using System.Windows.Markup;
+
+namespace Wox
+{
+    public class StringNullOrEmptyToVisibilityConverter : MarkupExtension, IValueConverter
+    {
+        public override object ProvideValue(IServiceProvider serviceProvider)
+        {
+            return this;
+        }
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return string.IsNullOrEmpty(value as string) ? Visibility.Collapsed : Visibility.Visible;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return null;
+        }
+    }
+}

Wox/Wox.csproj

@@ -144,6 +144,7 @@
     <Compile Include="SettingWindow.xaml.cs">
       <DependentUpon>SettingWindow.xaml</DependentUpon>
     </Compile>
+    <Compile Include="StringNullOrEmptyToVisibilityConverter.cs" />
     <Compile Include="WebSearchSetting.xaml.cs">
       <DependentUpon>WebSearchSetting.xaml</DependentUpon>
     </Compile>