[Bug 6716] Database box is not correctly renewed in IDOS

http://bugs.winehq.org/show_bug.cgi?id=6716

Petr Dlouhý <petr.dlouhy(a)email.cz> changed:

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--- Comment #30 from Petr Dlouhý <petr.dlouhy(a)email.cz> 2012-02-26 07:58:45 CST ---
Created attachment 39089
  --> http://bugs.winehq.org/attachment.cgi?id=39089
Possible fix of the bug and uncomplete test

Nikolay: Thanks for your answer, it did help.
Seems like I have get it all wrong. My previous test was testing the same thing
as test_customdraw(), so it was not proving anything. And the bug just didn't
show up, when disabling that notification.

I have new serious lead:
As I have learned out, it seems, that if CDRF_SKIPDEFAULT is returned from
Wndproc function after listview.c called it with CDDS_SUBITEM |
CDDS_ITEMPREPAINT, the drawing sequention is in fact not skipped.

If I remove line, that skips the rest of drawing sequence (as shown in the
patch), IDOS works perfectly.

The main proof I have got is, that when I run the test (also included in patch)
with native comctl32, then on the +message log are HDM_ORDERTOINDEX messages
shown right after CDRF_SKIPDEFAULT is returned from Windproc function (and with
built-in library there are no such messages).

The problem which I have is, that I haven't found a way to make a regular test
out of it. I don't know, how to really test, that the drawing really occured
(HDM_ORDERTOINDEX messages are not in message sequention).

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