EnC: member moves across partial definitions might be classified as renamed and not handled correctly

[tmat]

Version Used:
Version 16.9.0 Preview 4.0 [30920.304.main]

Steps to Reproduce:

Before edit

File 1:

partial class C
{
   void F1() {}
}

File 2:

partial class C
{
   void F2() {}
}

After edit:

File 1:

partial class C
{
   void F2() {}
}

File 2:

partial class C
{
   void F1() {}
}

See test NestedPartialTypeInPartialType_RenameInsertDeleteAndInsertVirtual

Expected Behavior:

Each document has semantic update of F1 and F2, respectively.

Actual Behavior:

"Can't rename" rude edit is reported.

[tmat]

Another scenario:

Before edit

File 1:

partial class C
{
   void F1() {}
}

File 2:

partial class C
{
   void F2() {}
}

After edit:

File 1:

partial class C
{
   void F1() {} // moved from file 2
   void F2() {}
}

File 2:

partial class C
{
   void F3() {} // added new method
}