We currently create a separate headless-browser application to serve two
purposes:
1. Allow headless browsing to take a screenshot of a page or print its
layout tree / internal text.
2. Run the LibWeb test framework.
This patch migrates (1) to the main Ladybird executable. The --headless
flag enables this mode. This matches the behavior of other browsers, and
means we have one less executable to ship at distribution time.
We want to avoid creating too many AppKit / Qt facilities in headless
mode. So this involves some shuffling of application init to ensure we
don't create them until after we've parsed the command line arguments.
Namely, we avoid creating the NSApp in AppKit and QCoreApplication in
Qt. Doing so also requires that we don't create the application event
loop until we've parsed the command line as well, because the loop we
create depends on whether we're creating those UI facilities.
The WebDriver spec now separately tracks an active HTTP session list,
which will contains all non-BiDi WebDriver sessions by default. There
may only be one active HTTP session at a time.
See: 63a397f
Session management is a bit awkward right now in that the list of active
sessions is managed by Client, resulting in operations like closing a
session being split between several functions in Client and Session.
This patch moves all session management to the Session class. Closing a
session is now entirely in Session::close().
This will make managing a separate HTTP session list a bit simpler.
Lots of editorial spec bugs here, but these changes largely affect how
the unhandledPromptBehavior capability is handled. We also now set an
additional capability for the default User Agent string.
