Don't generate documentation file in debug builds

src/ImGui.NET/ImGui.NET.csproj

@@ -13,7 +13,7 @@
     <PackageProjectUrl>https://github.com/mellinoe/imgui.net</PackageProjectUrl>
     <DisableImplicitFrameworkReferences>true</DisableImplicitFrameworkReferences>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
-    <DocumentationFile>bin\Debug\ImGui.NET.xml</DocumentationFile>
+    <DocumentationFile Condition="'$(Configuration)' == 'Release'">bin\Release\ImGui.NET.xml</DocumentationFile>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="System.Diagnostics.Debug" Version="4.0.11" />

src/ImGui.NET/TextInputBuffer.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
@@ -91,6 +92,7 @@ namespace ImGuiNET
             }
             set
             {
+                Debug.Assert(value != null);
                 if (value.Length > Length) // Doesn't fit into current buffer
                 {
                     FreeNativeBuffer();