add supplyLayoutDefaults handler for transform modules

Author: etpinard

src/plots/plots.js

@@ -364,6 +364,9 @@ plots.sendDataToCloud = function(gd) {
 // gd._fullLayout._basePlotModules
 //   is a list of all the plot modules required to draw the plot.
 //
+// gd._fullLayout._transformModules
+//   is a list of all the transform modules invoked.
+//
 plots.supplyDefaults = function(gd) {
     var oldFullLayout = gd._fullLayout || {},
         newFullLayout = gd._fullLayout = {},
@@ -643,6 +646,8 @@ plots.supplyDataDefaults = function(dataIn, dataOut, layout, fullLayout) {
         basePlotModules = fullLayout._basePlotModules = [],
         cnt = 0;
 
+    fullLayout._transformModules = [];
+
     function pushModule(fullTrace) {
         dataOut.push(fullTrace);
 
@@ -860,6 +865,8 @@ function supplyTransformDefaults(traceIn, traceOut, layout) {
             transformOut = _module.supplyDefaults(transformIn, traceOut, layout, traceIn);
             transformOut.type = type;
             transformOut._module = _module;
+
+            Lib.pushUnique(layout._transformModules, _module);
         }
         else {
             transformOut = Lib.extendFlat({}, transformIn);
@@ -1060,6 +1067,16 @@ plots.supplyLayoutModuleDefaults = function(layoutIn, layoutOut, fullData, trans
         }
     }
 
+    // transform module layout defaults
+    var transformModules = layoutOut._transformModules;
+    for(i = 0; i < transformModules.length; i++) {
+        _module = transformModules[i];
+
+        if(_module.supplyLayoutDefaults) {
+            _module.supplyLayoutDefaults(layoutIn, layoutOut, fullData, transitionData);
+        }
+    }
+
     // should FX be a component?
     Plotly.Fx.supplyLayoutDefaults(layoutIn, layoutOut, fullData);