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JavaScripts referenced by HTML loaded into a WKWebKitView by an application fail to load when the application name contains spaces.

This is a broad bug. If you quit Slack, rename it to "Slack X", and re-launch it (on 16E144f), it will simply show a blank window.

I've included a reductive case to demonstrate the issue as clearly as I can.

Steps to reproduce:

1. Start on a machine running 10.12.4 beta (16E144f)
2. Download and unzip the attached JavaScriptPathBug.zip file <https://smilesoftware.com/static/bugs/JavaScriptPathBug.zip>
3. Launch the JavaScriptPathBug app
*. You'll see both a direct then an indirect alert followed by "Hello, world!" in the window
4. Launch the "JavaScriptPathBug copy" app (a duplicate of the JavaScriptPathBug app but with a space in its name)
*. You'll only see the direct alert followed by "Hello, world!" in the window
5. Control-click on the window content and choose Inspect Element from the menu
6. Click Console, and you'll see the error: "Not allowed to load local resource <url>" followed by the error: "ReferenceError: Can't find variable: secondaryAlert" which is a consequence of the first error (see attached "Screen Shot 2017-01-31 at 10.00.59 AM.png" file)

Expected Result:

Expected that both "JavaScriptPathBug.app" and "JavaScriptPathBug copy.app" would behave identically.

Actual Result:

"JavaScriptPathBug copy.app" fails to load javaScriptBug.js.

Configuration:

MacBook Pro (Retina, 15-inch, Late 2013)
2.6 GHz Intel Core i7
16 GB 1600 MHz DDR3
NVIDIA GeForce GT 750M 2048 MB

macOS Version:

macOS 10.12.4 (16E144f)

Additional Notes:

Source is included in JavaScriptPathBug.zip for reference.