This also amends a commit from Brock Whittaker <brock@zulipchat.com>
that merges two separate functions for YouTube videos and Vimeo videos
into a generic video recall function.
Fixes#7550.
The top and bottom sections of the lightbox overlay do not close the
lightbox when clicked. Now, this triggers the close_overlay path when a
valid non-actionable background element is clicked.
Fixes: #7500.
The lightbox "v" shortcut should not show a user's avatar,
so this limits the scope of images it can choose to ones inside
of the `.message_content` div.
When a user clicks on the `.player-container` node and the click
target is actually that (and not the YT video iFrame within), then
hide the lightbox – they likely mean to exit out of the lightbox.
This commit forces the files that create modals to create their own
modal closing function instead of creating all of them in the modals
file. These functions are then passed to the modals.close object. This
is intended to remove modals.js's dependencies on these other files.
This modifies the lightbox to only display images inside the
".message_inline_image" class, rather than all images inside the
message body, which currently includes things like the bot icon.
This fixes the styling to stay on the screen of most reasonably sized
monitors along with extending the JavaScript code to allow for the
video to be keyed to in the lightbox.
This adds an image feed that you can scroll through with hotkeys
in the lightbox.
The left and right arrow keys along with the left and right arrows
will go to the prev/next image, and clicking on an image will also
take a user to that image.
