This seems to play well with Popups with and without
Ie8fa1672b9fd . However, it's not clear to me why this still works
and even gives priority to the Popups implementation when present,
regardless of the order the extensions are loaded in. Happily, this
is the desired behavior.
Bug: T363162
Change-Id: Ic479c0a381ee16d1abcecfdd5ee48f0afccc1d3f
PHP classes and test are somewhat copies from the Popups codebase.
Some refactoring was applied. More could be done. Not to sure if
this should happen more in follow ups though.
Could also reduce the complexity of checks on the JS side. Most of
these things can only change on page load. The only dynamic part
left is the anon user setting managed by the Popups extension.
Note, that I needed to add a new PHP config for here although the
other still exists and is needed in the Popups extension. This
will change, when the user settings code also moves.
I guess it's okay for now though. Both settings default to true
and are not overridden in the config repos.
Also needed to add the Gadget extension as phan dependency.
Bug: T362771
Depends-On: Ia028c41f8aaa1c522dfc7c372e1ce51e40933a5e
Change-Id: Ie6e8bc706235724494036c7f0d873f5c996c46e6
