make sure relayout(gd, 'width', null) resets width to default

Author: etpinard

src/plot_api/plot_api.js

@@ -1803,8 +1803,13 @@ function _relayout(gd, aobj) {
         // op and has no flag.
         undoit[ai] = (pleaf === 'reverse') ? vi : p.get();
 
+        // tweak width / height update value when null such that
+        // new dimensions are honored in Plots.supplyDefaults
+        if(['width', 'height'].indexOf(ai) !== -1 && vi === null) {
+            vi = 'initial';
+        }
         // check autorange vs range
-        if(pleafPlus.match(/^[xyz]axis[0-9]*\.range(\[[0|1]\])?$/)) {
+        else if(pleafPlus.match(/^[xyz]axis[0-9]*\.range(\[[0|1]\])?$/)) {
             doextra(ptrunk + '.autorange', false);
         }
         else if(pleafPlus.match(/^[xyz]axis[0-9]*\.autorange$/)) {

src/plots/plots.js

@@ -307,6 +307,7 @@ function positionPlayWithData(gd, container) {
         });
     }
 }
+
 plots.sendDataToCloud = function(gd) {
     gd.emit('plotly_beforeexport');
 
@@ -372,6 +373,7 @@ plots.supplyDefaults = function(gd) {
     // because fullData needs a few things from layout
 
     if(oldFullLayout._initialAutoSizeIsDone) {
+
         // coerce the updated layout while preserving width and height
         var oldWidth = oldFullLayout.width,
             oldHeight = oldFullLayout.height;
@@ -382,13 +384,15 @@ plots.supplyDefaults = function(gd) {
         if(!newLayout.height) newFullLayout.height = oldHeight;
     }
     else {
+
         // coerce the updated layout and autosize if needed
         plots.supplyLayoutGlobalDefaults(newLayout, newFullLayout);
 
         var missingWidthOrHeight = (!newLayout.width || !newLayout.height),
             autosize = newFullLayout.autosize,
             autosizable = gd._context && gd._context.autosizable,
             initialAutoSize = missingWidthOrHeight && (autosize || autosizable);
+
         if(initialAutoSize) plots.plotAutoSize(gd, newLayout, newFullLayout);
         else if(missingWidthOrHeight) plots.sanitizeMargins(gd);