patch 8.0.1358: undercurl is not used in the terminal

Problem:    Undercurl is not used in the terminal. (Kovid Goyal)
Solution:   Only fall back to underline when undercurl highlighting is not
            defined. (closes #1306)

Author: brammool

src/screen.c

@@ -8058,8 +8058,11 @@ screen_start_highlight(int attr)
 		out_str(T_ME);
 	    if ((attr & HL_STANDOUT) && T_SO != NULL)	/* standout */
 		out_str(T_SO);
-	    if ((attr & (HL_UNDERLINE | HL_UNDERCURL)) && T_US != NULL)
-						   /* underline or undercurl */
+	    if ((attr & HL_UNDERCURL) && T_UCS != NULL) /* undercurl */
+		out_str(T_UCS);
+	    if (((attr & HL_UNDERLINE)	    /* underline or undercurl */
+			|| ((attr & HL_UNDERCURL) && T_UCS == NULL))
+		    && T_US != NULL)
 		out_str(T_US);
 	    if ((attr & HL_ITALIC) && T_CZH != NULL)	/* italic */
 		out_str(T_CZH);
@@ -8177,7 +8180,15 @@ screen_stop_highlight(void)
 		else
 		    out_str(T_SE);
 	    }
-	    if (screen_attr & (HL_UNDERLINE | HL_UNDERCURL))
+	    if ((screen_attr & HL_UNDERCURL) && T_UCE != NULL)
+	    {
+		if (STRCMP(T_UCE, T_ME) == 0)
+		    do_ME = TRUE;
+		else
+		    out_str(T_UCE);
+	    }
+	    if ((screen_attr & HL_UNDERLINE)
+			    || ((screen_attr & HL_UNDERCURL) && T_UCE == NULL))
 	    {
 		if (STRCMP(T_UE, T_ME) == 0)
 		    do_ME = TRUE;

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1358,
 /**/
     1357,
 /**/