patch 9.0.0160: some diff mode tests fail

Problem:    Some diff mode tests fail.
Solution:   Only advance "ptr" when a text property follows.
diff --git a/src/drawline.c b/src/drawline.c
index fb662f7..6b0d5b5 100644
--- a/src/drawline.c
+++ b/src/drawline.c
@@ -3473,7 +3473,7 @@
 		    ) || lcs_eol_one == -1)
 		break;
 #ifdef FEAT_PROP_POPUP
-	    if (!wp->w_p_wrap)
+	    if (!wp->w_p_wrap && text_prop_follows)
 	    {
 		// do not output more of the line, only the "below" prop
 		ptr += STRLEN(ptr);