refs https://github.com/TryGhost/Team/issues/559
Click-to-close and escape-to-close functionality in `ember-promise-modals` was deferred to `focus-trap`. For some of our use-cases that wasn't ideal because there was nowhere to hook in if we wanted to abort modal closing for any reason (eg, to show an unsaved changes confirmation)
- bumped the custom fork version of `ember-promise-modals` to allow all focus-trap close-inducing behaviour to be disabled
- also adds a `beforeClose()` option when opening modals for future use
- changed modals service options that are passed through to `focus-trap` so that all close-inducing behaviour is disabled
- when the first modal is opened add event handlers for clicks and <kbd>Escape</kbd> key presses that should close modals and manually call `.close()` on the top-most modal in the stack
- remove event handlers when the last modal is removed
refs https://github.com/TryGhost/Team/issues/559
We want to get rid of our existing modals implementation because it doesn't play well with Glimmer compoments and the animation library it uses is now unmaintained and blocking our Ember.js upgrades.
- installed addon using customised fork
- fork allows passthrough of `allowOutsideClick` to `focus-trap` so we can allow clicks on dropdowns and other wormholed content inside of a modal
- extended the `modals` service locally so we can customise click-outside-to-close behaviour and tie in with our `dropdowns` service
- set up styles in `modals-new.css`, mostly copied from `modals.css` with a few specific overrides
- once all modals are converted we can drop the old `modals.css` and rename `modals-new.css`
