Fix bug in Liang–Barsky clipping.

d3.js

@@ -6332,7 +6332,7 @@ d3 = function() {
     }
   }
   function d3_geo_clipViewT(num, denominator, t) {
-    if (Math.abs(denominator) < ε) return num > ε;
+    if (Math.abs(denominator) < ε) return num < 0;
     var u = num / denominator;
     if (denominator > 0) {
       if (u > t[1]) return false;

src/geo/clip-view.js

@@ -177,7 +177,7 @@ function d3_geo_clipView(x0, y0, x1, y1) {
 }
 
 function d3_geo_clipViewT(num, denominator, t) {
-  if (Math.abs(denominator) < ε) return num > ε;
+  if (Math.abs(denominator) < ε) return num < 0;
 
   var u = num / denominator;