viewportSize causes crash - 2.0 & Master

[BenjaminLeeMiller]

I am just learning phantomJS so it is possible I am missing something and this isn't a real bug, but it seems to be.

I am following the instructions for taking a screenshot and wanted to change the viewportSize so that I could get the a screenshot that was more representative of the actual page as a user sees it. Here is the code I am using:

var page = require('webpage').create();
page.viewportSize = {width: 800, height: 800};
page.open('https://www.ruby-lang.org/en/documentation', function(status) {
console.log("Status: " + status);
if(status === "success") {
page.render('ruby.png');
}
phantom.exit();
});

When I execute this script, i get:

Status: success
Assertion failed: (_consumed <= scratch_size), function _hb_coretext_shape, file src/hb-coretext.cc, line 764.
Abort trap: 6

I have tried building 2.0 from source, master from source, and brew installing PhantomJS. All produce the same result.

One interesting fact, if I drop the viewportSize to 400 x 400 or remove it, I instead get

libpng error: Read Error

Additionally, if I change the url to "https://www.ruby-lang.org/", the code runs without error, but no image gets generated.

This same code works fine if I switch the url to some other site such as http://www.askart.com/AskART/artists/search/Search_Repeat.aspx?searchtype=AUCTION_RECORDS&artist=111780

[vitallium]

Duplicate of #12918.