Add the 'concealcursor' option to decide when the cursor line is to be
concealed or not.
Rename 'conc' to 'cole' as the short name for 'conceallevel'.
diff --git a/src/undo.c b/src/undo.c
index 77f57bc..58b55ba 100644
--- a/src/undo.c
+++ b/src/undo.c
@@ -2711,7 +2711,7 @@
 
 	FOR_ALL_WINDOWS(wp)
 	{
-	    if (wp->w_buffer == curbuf && wp->w_p_conc > 0)
+	    if (wp->w_buffer == curbuf && wp->w_p_cole > 0)
 		redraw_win_later(wp, NOT_VALID);
 	}
     }