Autoloader Plugin causes Command Line Plugin to run twice when used from CDN breaking data-filter-* on <pre>

Information:

• Prism version: v1.29.0 via CDN
• Plugins: Autoloader, Command Line
• Environment: Browser

Description

This bug occurs when Prism is loaded from a CDN or in a manner similar to a CDN. It does not occur when using a packaged bundle from the website.

When the Autoloader and Command Line plugins are both loaded, the Autoloader plugin causes Prism to scan a document for code boxes twice. When using the Command Line plugin with the data-filter-output="(out)" or the data-filter-continuation="(con)" attribute, the plugin outputs the expected result on the first pass - removing the prefixes and setting the lines to outputs. When Autoloader causes it to run a second time (once the grammar loads, I would assume), there are no longer any prefix on the code block lines, causing the Command Line plugin to think that every line is an input line.

Example

GitLab - contains example .html files and download copy of the Autoloader and Command Line plugins for testing. The files ending in from_git have a copy and pasted version of this file that I used to try and debug what was happening.

JSFiddles (for the .html files in the repo):

• ERR_autoload-cmd_from_cdn.html
• ERR_autoload-prism_from_git.html
• NOERR_no-autoload-prism_from_git.html
• NOERR_autoload-cmd_from_website.html

Reproduce the issue using the linked JSFiddles or the GitLab HTML examples with the Autoloader and Command Line plugins loaded from a CDN. Read the plugin files, especially prism-command-line.js and the Autoloader entry point, and trace both document scans; done means data-filter-output="(out)" and data-filter-continuation="(con)" still produce the expected inputs and outputs after grammar loading.