Increase width a bit more

src/Avalonia.Diagnostics/Diagnostics/Views/TreePageView.xaml

@@ -2,7 +2,7 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:vm="clr-namespace:Avalonia.Diagnostics.ViewModels"
              x:Class="Avalonia.Diagnostics.Views.TreePageView">
-  <Grid ColumnDefinitions="0.5*,4,*">    
+  <Grid ColumnDefinitions="0.8*,4,*">    
     <TreeView Name="tree"
               BorderThickness="0"
               Items="{Binding Nodes}"