Step to reproduce:
1. Apply 'Rename file to match type name' action to Class1 in Class1_1.cs file:
File Class1.cs:

namespace ClassLibrary1
{
    public partial class Class1
    {
    }
}

File Class1_1.cs:

namespace ClassLibrary1
{
    public partial class Class1
    {
    }
}

Result: there is no changes in Class1_1.cs - it's correct.
It would be better to remove 'Rename file to match type name' action in this case.

Issue was closed