Fix containment check for reversed ranges.

Author: darabos

src/plots/cartesian/set_convert.js

@@ -448,11 +448,10 @@ module.exports = function setConvert(ax, fullLayout) {
 
     ax.isPtWithinRange = function(d, calendar) {
         var coord = ax.c2l(d[axLetter], null, calendar);
+        var r0 = ax.r2l(ax.range[0]);
+        var r1 = ax.r2l(ax.range[1]);
 
-        return (
-            coord >= ax.r2l(ax.range[0]) &&
-            coord <= ax.r2l(ax.range[1])
-        );
+        return Math.min(r0, r1) <= coord && coord <= Math.max(r0, r1);
     };
 
     ax.clearCalc = function() {