Check path length on adding them to the cache and log error if a path is too long.

Penumbra.GameData/ByteString/ByteStringFunctions.Construction.cs

@@ -35,7 +35,7 @@ public static unsafe partial class ByteStringFunctions
         var path = ( byte* )Marshal.AllocHGlobal( length + 1 );
         fixed( char* ptr = s )
         {
-            Encoding.UTF8.GetBytes( ptr, length, path, length + 1 );
+            Encoding.UTF8.GetBytes( ptr, s.Length, path, length + 1 );
         }
 
         path[ length ] = 0;

Penumbra.GameData/ByteString/Utf8RelPath.cs

@@ -36,7 +36,7 @@ public readonly struct Utf8RelPath : IEquatable< Utf8RelPath >, IComparable< Utf
             return true;
         }
 
-        var substring = s!.Replace( '/', '\\' ).TrimStart('\\');
+        var substring = s.Replace( '/', '\\' ).TrimStart('\\');
         if( substring.Length > MaxRelPathLength )
         {
             return false;

Penumbra/Collections/ModCollection.Cache.Access.cs

@@ -87,7 +87,7 @@ public partial class ModCollection
             return true;
         }
 
-        PluginLog.Error( $"Could not add the redirection {path} to {fullPath}, the redirected path is too long." );
+        PluginLog.Error( $"The redirected path is too long to add the redirection\n\t{path}\n\t--> {fullPath}" );
         return false;
     }
 

Penumbra/Collections/ModCollection.Cache.cs

@@ -326,8 +326,10 @@ public partial class ModCollection
         // Inside the same mod, conflicts are not recorded.
         private void AddFile( Utf8GamePath path, FullPath file, IMod mod )
         {
-            if (!CheckFullPath( path, file ))
+            if( !CheckFullPath( path, file ) )
+            {
                 return;
+            }
 
             if( ResolvedFiles.TryAdd( path, new ModPath( mod, file ) ) )
             {

Penumbra/UI/Classes/ModEditWindow.Files.cs

@@ -319,7 +319,10 @@ public partial class ModEditWindow
         if( ImGuiUtil.DrawDisabledButton( "Apply Changes", Vector2.Zero, tt, !changes ) )
         {
             var failedFiles = _editor!.ApplyFiles();
-            PluginLog.Information( $"Failed to apply {failedFiles} file redirections to {_editor.CurrentOption.Name}." );
+            if( failedFiles > 0 )
+            {
+                PluginLog.Information( $"Failed to apply {failedFiles} file redirections to {_editor.CurrentOption.FullName}." );
+            }
         }