[2/2] richedit: Fixed implementation of WM_GETDLGCODE message.

[Dylan Smith]

This fixes inconsistencies shown in the tests I added for the
WM_GETDLGCODE.  The tests covered different cases handled by the current
implementation in order to show that the native implementation is
simpler for all these cases.

I also modified and ran the tests (changing the class and module names
for the added tests) for version 1.0 and version 4.1 of the richedit
controls to ensure the current implementation wasn't based on other
native versions.

This also aims to fix Bug 5537.
---
 dlls/riched20/editor.c       |   18 +++---------------
 dlls/riched20/tests/editor.c |   26 +++++++++++++-------------
 2 files changed, 16 insertions(+), 28 deletions(-)
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