added the xclearwin patch to fix dirty borders after changing colors

config.h

@@ -108,7 +108,7 @@ char *termname = "st-256color";
 unsigned int tabspaces = 8;
 
 /* bg opacity */
-float alpha = 0.8;
+float alpha = 0.9;
 
 /* Terminal colors (16 first used in escape sequence) */
 static const char *colorname[] = {

st.c

@@ -1970,6 +1970,8 @@ strhandle(void)
 				 * TODO if defaultbg color is changed, borders
 				 * are dirty
 				 */
+				if (j == defaultbg)
+					xclearwin();
 				redraw();
 			}
 			return;

win.h

@@ -37,3 +37,4 @@ void xsetpointermotion(int);
 void xsetsel(char *);
 int xstartdraw(void);
 void xximspot(int, int);
+void xclearwin(void);

x.c

@@ -831,6 +831,13 @@ xclear(int x1, int y1, int x2, int y2)
 			x1, y1, x2-x1, y2-y1);
 }
 
+void
+xclearwin(void)
+{
+	xclear(0, 0, win.w, win.h);
+}
+
+
 void
 xhints(void)
 {