user32: Check for bad scroll value and fix return values in EDIT_EM_Scroll

David Hedberg david.hedberg at
Tue Sep 4 17:21:37 CDT 2007

This patch adds a fix for cases where dy in EDIT_EM_Scroll can become
negative even after receiving a SB_PAGEDOWN. It also makes the
function behave as its windows counterpart and return false if dy is
Fixes bug 1517.
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