riched20: Fix behavior of EM_REPLACESEL with painting disabled

[Alex Villací­s Lasso]

I noticed a style being applied on an incorrect region in an application 
called RadDecay. The red font was being applied only to a part of the 
line. I traced this to the app disabling updates on the richedit control 
used for displaying information, and then adding text with 
EM_REPLACESEL. The StartRow run is not being inserted at the start of 
the paragraph when painting is disabled, resulting in an incorrect line 
count being reported by EM_GETLINECOUNT, and therefore the app 
calculating the wrong offsets for applying the style. Fixed by moving 
the relevant call to ME_WrappedMarkedParagraphs() to a place before the 
check for painting being enabled. With tests that failed before the fix 
and now succeed.

Changelog:
* Fix behavior of  line splitting by EM_REPLACESEL with a text with 
newlines and window updating disabled.
* Tests to verify fixed behavior.

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

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