Double clicking on template item adds it to the template.

Source/LibationAvalonia/Dialogs/EditTemplateDialog.axaml

@@ -22,6 +22,7 @@
 			<TextBox
 				Grid.Column="0"
 				Grid.Row="1"
+				Name="userEditTbox"
 				FontFamily="{Binding FontFamily}"
 				Text="{Binding UserTemplateText, Mode=TwoWay}" />
 
@@ -43,6 +44,7 @@
 					BorderThickness="1"
 					GridLinesVisibility="All"
 					AutoGenerateColumns="False"
+					DoubleTapped="EditTemplateViewModel_DoubleTapped"
 					Items="{Binding ListItems}" >
 
 					<DataGrid.Columns>

Source/LibationAvalonia/Dialogs/EditTemplateDialog.axaml.cs

@@ -1,12 +1,9 @@
-using Avalonia.Data;
-using Avalonia.Data.Converters;
 using Avalonia.Markup.Xaml;
 using Avalonia.Media;
 using Dinah.Core;
 using LibationFileManager;
 using System;
 using System.Collections.Generic;
-using System.Globalization;
 using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
@@ -17,22 +14,6 @@ using Avalonia.Controls;
 
 namespace LibationAvalonia.Dialogs
 {
-	class BracketEscapeConverter : IValueConverter
-	{
-		public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
-		{
-			if (value is string str && str[0] != '<' && str[^1] != '>')
-				return $"<{str}>".Replace("->", "-\x200C>").Replace("<-", "<\x200C-");
-			return new BindingNotification(new InvalidCastException(), BindingErrorType.Error);
-		}
-
-		public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
-		{
-			if (value is string str && str[0] == '<' && str[^1] == '>')
-				return str[1..^2].Replace("-\x200C>", "->").Replace("<\x200C-", "<-");
-			return new BindingNotification(new InvalidCastException(), BindingErrorType.Error);
-		}
-	}
 	public partial class EditTemplateDialog : DialogWindow
 	{
 		// final value. post-validity check
@@ -43,6 +24,7 @@ namespace LibationAvalonia.Dialogs
 		public EditTemplateDialog()
 		{
 			AvaloniaXamlLoader.Load(this);
+			userEditTbox = this.FindControl<TextBox>(nameof(userEditTbox));
 			if (Design.IsDesignMode)
 			{
 				AudibleUtilities.AudibleApiStorage.EnsureAccountsSettingsFileExists();
@@ -63,6 +45,18 @@ namespace LibationAvalonia.Dialogs
 			DataContext = _viewModel;
 		}
 
+
+		public void EditTemplateViewModel_DoubleTapped(object sender, Avalonia.Input.TappedEventArgs e)
+		{
+			var dataGrid = sender as DataGrid;
+
+			var item = dataGrid.SelectedItem as Tuple<string, string>;
+			var text = userEditTbox.Text;
+
+			userEditTbox.Text = text.Insert(Math.Min(Math.Max(0, userEditTbox.CaretIndex), text.Length), item.Item1);
+			userEditTbox.CaretIndex += item.Item1.Length;
+		}
+
 		protected override async Task SaveAndCloseAsync()
 		{
 			if (!await _viewModel.Validate())
@@ -99,6 +93,7 @@ namespace LibationAvalonia.Dialogs
 							t.Description)
 						)
 					);
+
 			}
 
 			// hold the work-in-progress value. not guaranteed to be valid

Source/LibationWinForms/Dialogs/EditTemplateDialog.Designer.cs

@@ -103,13 +103,16 @@
 			this.listView1.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
             this.columnHeader1,
             this.columnHeader2});
-			this.listView1.HideSelection = false;
+			this.listView1.FullRowSelect = true;
+			this.listView1.GridLines = true;
 			this.listView1.Location = new System.Drawing.Point(12, 56);
+			this.listView1.MultiSelect = false;
 			this.listView1.Name = "listView1";
 			this.listView1.Size = new System.Drawing.Size(328, 283);
 			this.listView1.TabIndex = 3;
 			this.listView1.UseCompatibleStateImageBehavior = false;
 			this.listView1.View = System.Windows.Forms.View.Details;
+			this.listView1.DoubleClick += new System.EventHandler(this.listView1_DoubleClick);
 			// 
 			// columnHeader1
 			// 

Source/LibationWinForms/Dialogs/EditTemplateDialog.cs

@@ -5,6 +5,7 @@ using System.IO;
 using System.Windows.Forms;
 using Dinah.Core;
 using LibationFileManager;
+using System.Windows.Controls;
 
 namespace LibationWinForms.Dialogs
 {
@@ -59,7 +60,7 @@ namespace LibationWinForms.Dialogs
 
 			// populate list view
 			foreach (var tag in template.GetTemplateTags())
-				listView1.Items.Add(new ListViewItem(new[] { $"<{tag.TagName}>", tag.Description }));
+				listView1.Items.Add(new System.Windows.Forms.ListViewItem(new[] { $"<{tag.TagName}>", tag.Description }));
 		}
 
 		private void resetToDefaultBtn_Click(object sender, EventArgs e) => resetTextBox(template.DefaultTemplate);
@@ -197,5 +198,16 @@ namespace LibationWinForms.Dialogs
 			this.DialogResult = DialogResult.Cancel;
 			this.Close();
 		}
+
+		private void listView1_DoubleClick(object sender, EventArgs e)
+		{
+			var item = listView1.SelectedItems[0];
+			var text = templateTb.Text;
+
+			var selStart = Math.Min(Math.Max(0, templateTb.SelectionStart), text.Length);
+
+			templateTb.Text = text.Insert(selStart, item.Text);
+			templateTb.SelectionStart = selStart + item.Text.Length;
+		}
 	}
 }