[Gnash-commit] [bug #42395] No respons from panopticlick site when gnash is activated

[Nutchanon Wetchasit]

Follow-up Comment #2, bug #42395 (project gnash):

I've looked more closely, and I found that Panopticlick's Flash file is
not really using ExternalInterface, but uses the old-school plugin-provided
`GetVariable(variablePath)` facility, which fetch value from Flash variable
_as String_, regardless of variable's actual type within Flash.

In Panopticlick case, the variable in question is an Array named `user_fonts`
in root movie, accessed using `GetVariable("/:user_fonts")` from JavaScript.
The content of `user_fonts` is a value returned from
`TextField.getFontList()`
static function call.

Gnash seems to have several problem with this:
* Gnash didn't resolve variable path in slash-colon notation correctly.
* Gnash didn't pass some variable types (like Infinity Number, NaN Number,
Array, and Object) through GetVariable() properly.
* Calling `TextField.getFontList()` under Gnash somehow caused ActionScript
error (and return `undefined`).

First and third problem caused `null` to be returned to JavaScript,
second problem in Array/Object case caused Gnash plugin to crash.

Gnash: 0.8.11dev (git 88f86a3 19-Aug-2015) NPAPI
Adobe Flash Player: 11.2 r202 (11.2.202.491) NPAPI binary
Browser: Iceweasel 10.0.12 (debian)
System: Debian GNU/Linux 7.0 Wheezy i386

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