Search for member doesn't support generic FQ Name

[Ralf1108]

Is your feature request related to a problem? Please describe.
The search functionality doesn't work with generic type FQ Names like "IlSpyBugTest.ClassWithGenericType`1"

Describe the solution you'd like
When "IlSpyBugTest.ClassWithGenericType`1" is entered into the search term it should show the matching type

Additional context

Reproduce steps:

1. Create assembly with a generic class:

namespace IlSpyBugTest
{
    class ClassWithGenericType<T>
    {
    }
}

2. open assembly in ILSpy
3. copy FQ Name from generic class
   
4. enter FQ Name into search box (Types and Members)
   

No type shows up!

If the backtick is removed then the type is shown: