refactor: move binding for ToolTip.IsOpen from code to axaml

Signed-off-by: leo <longshuang@msn.cn>

src/Views/CommitBaseInfo.axaml

@@ -203,6 +203,13 @@
                                     FullMessage="{Binding #ThisControl.FullMessage}"
                                     HorizontalAlignment="Stretch"
                                     TextWrapping="Wrap">
+            <ToolTip.IsOpen>
+              <MultiBinding Converter="{x:Static BoolConverters.And}">
+                <Binding Path="$self.IsPointerOver"/>
+                <Binding Path="$self.(ToolTip.Tip)" Converter="{x:Static ObjectConverters.IsNotNull}"/>
+              </MultiBinding>
+            </ToolTip.IsOpen>
+            
             <v:CommitMessagePresenter.DataTemplates>
               <DataTemplate DataType="m:Commit">
                 <StackPanel MinWidth="400" Orientation="Vertical">

src/Views/CommitMessagePresenter.cs

@@ -5,8 +5,6 @@ using System.Threading.Tasks;
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Controls.Documents;
-using Avalonia.Data;
-using Avalonia.Data.Converters;
 using Avalonia.Input;
 using Avalonia.Threading;
 using Avalonia.VisualTree;
@@ -26,21 +24,6 @@ namespace SourceGit.Views
 
         protected override Type StyleKeyOverride => typeof(SelectableTextBlock);
 
-        public CommitMessagePresenter()
-        {
-            var bindings = new MultiBinding()
-            {
-                Converter = BoolConverters.And,
-                Bindings = new[]
-                {
-                    new Binding() { Path = "IsPointerOver", Source = this },
-                    new Binding() { Path = "(ToolTip.Tip)", Source = this, TypeResolver = (_, name) => name == "ToolTip" ? typeof(ToolTip) : null, Converter = ObjectConverters.IsNotNull },
-                }
-            };
-
-            Bind(ToolTip.IsOpenProperty, bindings);
-        }
-
         protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
         {
             base.OnPropertyChanged(change);