Modebar download button auto-size image

[marcusblevin]

I would like to request the modeBarButtons.toImage function be expanded to include the current plot dimensions when creating the image.

modeBarButtons.toImage = {
name: 'toImage',
title: 'Download plot as a png',
icon: Icons.camera,
click: function(gd) {
var format = 'png';
var w = gd.offsetWidth;
var h = gd.offsetHeight;

    Lib.notifier('Taking snapshot - this may take a few seconds', 'long');

    if(Lib.isIE()) {
        Lib.notifier('IE only supports svg.  Changing format to svg.', 'long');
        format = 'svg';
    }

    downloadImage(gd, {'format': format, **width: w, height: h**})
      .then(function(filename) {
          Lib.notifier('Snapshot succeeded - ' + filename, 'long');
      })
      .catch(function() {
          Lib.notifier('Sorry there was a problem downloading your snapshot!', 'long');
      });
}

};

Thanks

[etpinard]

duplicate of #1576