richedit: Return FALSE for EM_LINESCROLL with single line control.

[Dylan Smith]

---
 dlls/riched20/editor.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
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diff --git a/dlls/riched20/editor.c b/dlls/riched20/editor.c
index 2a053d7..2a4a443 100644
--- a/dlls/riched20/editor.c
+++ b/dlls/riched20/editor.c
@@ -3374,8 +3374,10 @@ LRESULT ME_HandleMessage(ME_TextEditor *editor, UINT msg, WPARAM wParam,
   }
   case EM_LINESCROLL:
   {
+    if (!(editor->styleFlags & ES_MULTILINE))
+      return FALSE;
     ME_ScrollDown(editor, lParam * 8); /* FIXME follow the original */
-    return TRUE; /* Should return false if a single line richedit control */
+    return TRUE;
   }
   case WM_CLEAR:
   {