richedit: (1/4) Tests for visibility behavior of richedit scrollbars, with todo_wine

Alex Villací­s Lasso a_villacis at
Mon Jul 21 12:52:23 CDT 2008

Some applications have never heard of ES_DISABLENOSCROLL and attempt to 
force scrollbars to be always shown (with ShowScrollBar() or similar) 
when otherwise richedit would hide them. If richedit attempts to wrestle 
control back, a recursive loop of requests can result if app overrides 
WM_SIZE behavior. Apparently native never reads the scrollbar state, and 
operates from some sort of internal state, so that scrollbars can be 
modified externally without native trying to wrestle back control. This 
is confirmed by attached tests. An exception: EM_SCROLL will restore 
visibility to a scrollbar that was forcibly hidden.

This is a rework of an earlier patch, split into four pieces for easier 
review. I have tested this on WinXP-SP2 but would like it to be tested 
in other versions as well.

* Tests for forced (in)visibility of richedit scrollbars, with todo_wine

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

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