feature<WorkingCopy>: show waiting panel while commiting

src/Resources/Locales/en_US.xaml

@@ -413,6 +413,7 @@
 
     <sys:String x:Key="Text.Waiting.UpdateSubmodule">WAITING SUBMOUDLE UPDATE COMPLETE...</sys:String>
     <sys:String x:Key="Text.Waiting.Staging">WAITING STAGE COMPLETE...</sys:String>
+    <sys:String x:Key="Text.Waiting.Commit">WAITING COMMIT COMPLETE ...</sys:String>
 
     <sys:String x:Key="Text.NotConfigured">Git has NOT been configured.\nPlease to go [Preference] and configure it first.</sys:String>
     <sys:String x:Key="Text.PathNotFound">Path[{0}] not exists!</sys:String>

src/Resources/Locales/zh_CN.xaml

@@ -413,6 +413,7 @@
 
     <sys:String x:Key="Text.Waiting.UpdateSubmodule">等待子模块更新完成...</sys:String>
     <sys:String x:Key="Text.Waiting.Staging">等待暂存完成 ...</sys:String>
+    <sys:String x:Key="Text.Waiting.Commit">等待提交完成 ...</sys:String>
 
     <sys:String x:Key="Text.NotConfigured">GIT尚未配置。请打开【偏好设置】配置GIT路径。</sys:String>
 	<sys:String x:Key="Text.PathNotFound">路径（{0}）不存在或不可读取!</sys:String>

src/UI/WorkingCopy.xaml.cs

@@ -914,7 +914,7 @@ namespace SourceGit.UI {
             }
         }
 
-        private async void Commit(object sender, RoutedEventArgs e) {
+        private void Commit(object sender, RoutedEventArgs e) {
             foreach (var c in UnstagedListData) {
                 if (c.IsConflit) {
                     App.RaiseError("You have unsolved conflicts in your working copy!");
@@ -933,8 +933,10 @@ namespace SourceGit.UI {
             txtCommitMsg.GetBindingExpression(TextBox.TextProperty).UpdateSource();
             if (Validation.GetHasError(txtCommitMsg)) return;
 
-            bool succ = await Task.Run(() => Repo.DoCommit(CommitMessage, amend));
-            if (succ) ClearMessage();
+            Waiting.Show(Repo, "Text.Waiting.Commit", () => {
+                bool succ = Repo.DoCommit(CommitMessage, amend);
+                if (succ) Dispatcher.Invoke(ClearMessage);
+            });
         }
 
         private async void CommitAndPush(object sender, RoutedEventArgs e) {