This change will allow auto generated video thumbnails to be used
instead of the black video thumbnail that overlays videos.
Follow up to: 2443446e62bff9dd8a0493d10e5359a5e946a84e
Preloading just metadata is not always respected by browsers, and
sometimes the whole video will be downloaded. This switches to using a
placeholder image for the video and only loads the video when the play
button is clicked.
* UX: replace highlight vars in popup menu
* UX: replace highlight vars in autcomplete
* UX: replace highlight vars in menu-panel
* UX: update style guide
* UX: bulk replace highlight vars in various small appearances
Currently when generating a onebox for Discourse topics, some important
context is missing such as categories and tags.
This patch addresses this issue by introducing a new onebox engine
dedicated to display this information when available. Indeed to get this
new information, categories and tags are exposed in the topic metadata
as opengraph tags.
The lint warnings were:
```
inline-block is ignored due to the float. If 'float' has a value other than 'none', the box is floated and 'display' is treated as 'block'
scss(propertyIgnoredDueToDisplay)
```
- Sets `https://www.mixcloud.com` as a `requires_iframe_origins` to allow the iframe content to be displayed
- Attempts to render something approximating the Mixcloud content in the preview pane of the Composer, rather than just displaying a large version of the artwork associated with the link
We are no longer able to display the image returned by Instagram directly within a Discourse site (either in the composer, or within a cooked post within a topic), so:
- Display an image placeholder in the composer preview
- A cooked post should use an iframe to display the Instagram 'embed' content
* FIX: Improve GitHub folder regexp in Onebox
It used to match any GitHub URL that was not matched by the other GitHub
Oneboxes and it did not do a good job at handling those. With this
change, the generic Onebox will handle the remaining URLs.
* FEATURE: Add Onebox for GitHub Actions
* FEATURE: Add Onebox for PR check runs
* FIX: Remove image from GitHub folder Oneboxes
It is a generic, auto-generated image which does not provide any value.
* DEV: Add tests
* FIX: Strip HTML comments from PR body
Not all videos can be rendered everywhere because some browser may be
missing some codecs. This commit adds a notice on top of video to let
the user know about it.
