richedit: do not read actual scrollbar state for scrollbar update, use internal state instead (RESEND)

[Alex Villací­s Lasso]

Alex Villací­s Lasso escribió:
> Alex Villací­s Lasso escribió:
>> This is supposed to be a fix for bug #12311 . This bug involves a 
>> recursive message loop where the application forces visibility of 
>> scrollbars for the richedit control, which causes a WM_SIZE that 
>> triggers an update of the window size and re-hiding of the scrollbar. 
>> However, just after exiting the richedit winproc, the app forces 
>> visibility again, which again triggers a WM_SIZE, and so on. Native 
>> is oblivious to the fact that an external agent is messing with the 
>> scrollbar visibility, and is therefore unaffected by recursion. This 
>> patch attempts to fix this behavior in builtin and test for it. I 
>> have tried to test it on WinXP-SP2 and Win98, but testing on other 
>> platforms is helpful too.
>>
>> Changelog:
>> * Use internal copy of scrollbar state instead of directly reading 
>> state from scrollbars, just as native does.
>> * Tests for ability to externally modify scrollbars.
>> * Test for behavior that caused recursion until builtin richedit was 
>> fixed.
>>
>> ------------------------------------------------------------------------
>>
Resending. Please comment on this patch.

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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