Zoom: Move REDRAWDELAY to constants file

Author: mdtusz

src/plots/cartesian/constants.js

@@ -69,5 +69,8 @@ module.exports = {
     HOVERMINTIME: 50,
 
     // max pixels off straight before a lasso select line counts as bent
-    BENDPX: 1.5
+    BENDPX: 1.5,
+
+    // delay before a redraw (relayout) after smooth panning and zooming
+    REDRAWDELAY: 50
 };

src/plots/cartesian/dragbox.js

@@ -347,7 +347,7 @@ module.exports = function dragBox(gd, plotinfo, x, y, w, h, ns, ew) {
     var scrollViewBox = [0, 0, pw, ph],
         // wait a little after scrolling before redrawing
         redrawTimer = null,
-        REDRAWDELAY = 50,
+        REDRAWDELAY = constants.REDRAWDELAY,
         mainplot = plotinfo.mainplot ?
             fullLayout._plots[plotinfo.mainplot] : plotinfo;