Fix ugly rounded corners

src/x11/x.c

@@ -110,10 +110,13 @@ static void x_win_round_corners(struct window_x11 *win, const int rad)
 
         /* To mark all pixels, which should get exposed, we
          * use a circle for every corner and two overlapping rectangles */
+	int fw = settings.frame_width / 2 + settings.frame_width % 2;
+	if (fw < 1)
+		fw=1;
         unsigned const int centercoords[] = {
-                0,               0,
-                width - dia - 1, 0,
-                0,               height - dia - 1,
+                -fw,             -fw,
+                width - dia - 1, -fw,
+                -fw,             height - dia - 1,
                 width - dia - 1, height - dia - 1,
         };
 
@@ -123,8 +126,8 @@ static void x_win_round_corners(struct window_x11 *win, const int rad)
                          shape_gc,
                          centercoords[i],
                          centercoords[i+1],
-                         dia,
-                         dia,
+                         dia+fw,
+                         dia+fw,
                          degrees * 0,
                          degrees * 360);
         }