tried adding undercurl fix

config.def.h

@@ -35,7 +35,6 @@ static float chscale = 1.0;
  * More advanced example: L" `'\"()[]{}"
  */
 wchar_t *worddelimiters = L" ";
-
 /* selection timeouts (in milliseconds) */
 static unsigned int doubleclicktimeout = 300;
 static unsigned int tripleclicktimeout = 600;

desktop.h

@@ -71,6 +71,15 @@ static unsigned int blinktimeout = 800;
 static unsigned int cursorshape = 3;
 static unsigned int cursorthickness = 2;
 
+/*
+ * Undercurl styling
+ */
+#define UNDERCURL_CURLY 0
+#define UNDERCURL_SPIKY 1
+#define UNDERCURL_CAPPED 2
+// active
+#define UNDERCURL_STYLE UNDERCURL_CAPPED
+
 /*
  * bell volume. It must be a value between -100 and 100. Use 0 for disabling
  * it