riched20: fixes and additional conformance tests for EM_EXSETSEL

[Lei Zhang]

Hi,

Changelog:
* Check the input to EM_EXSETSEL
* Fixes bug 6814
* Added more comprehensive conformance tests for EM_EXSETSEL

 editor.c       |   52 +++++++++++++++++++++---
 tests/editor.c |  103 +++++++++++++++++++++++++++++++------------------
 2 files changed, 112 insertions(+), 43 deletions(-)
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