- Initialize JavaScript in webenginesettings.py instead of webenginetab.py
- Move JavaScript snippet into a .js file
- Make sure scripts can be re-run and do nothing if already run.
- Run scripts on DocumentCreation *and* DocumentReady. Closes#3717.
- Give each script an unique name for debugging.
- Also make custom stylesheets work on chrome:// pages
With QtWebKit or QtWebEngine with Qt < 5.7, the functions end up in the
page's namespace. We can't easily avoid this, but at least we can name
them in a way which reduces conflicts.
webelem.javascript_escape got renamed to javascript.string_escape, and a
new javascript.assemble got added to make it easier to call a function
inside a .js file.
