This commit introduces a new site setting: `block_hotlinked_media`. When enabled, all attempts to hotlink media (images, videos, and audio) will fail, and be replaced with a linked placeholder. Exceptions to the rule can be added via `block_hotlinked_media_exceptions`.
`download_remote_image_to_local` can be used alongside this feature. In that case, hotlinked images will be blocked immediately when the post is created, but will then be replaced with the downloaded version a few seconds later.
This implementation is purely server-side, and does not impact the composer preview.
Technically, there are two stages to this feature:
1. `PrettyText.sanitize_hotlinked_media` is called during `PrettyText.cook`, and whenever new images are introduced by Onebox. It will iterate over all src/srcset attributes in the post HTML and check if they're allowed. If not, the attributes will be removed and replaced with a `data-blocked-hotlinked-src(set)` attribute
2. In the `CookedPostProcessor`, we iterate over all `data-blocked-hotlinked-src(set)` attributes and check whether we have a downloaded version of the media. If yes, we update the src to use the downloaded version. If not, the entire media element is replaced with a placeholder. The placeholder is labelled 'external media', and is a link to the offsite media.
If the select-kit header is not in the viewport (scrolled out of view), popper adds a data-popper-reference-hidden attribute.
This PR adds the recommended styles to "hide" the select-kit body when that happens. See
https://popper.js.org/docs/v2/modifiers/hide/
The composer is displayed over the bottom part of the page. To make sure
that no content is covered by the composer, a bottom padding is added
equal to the height of the composer. When the composer is opened or
closed that padding is added after around 300ms because of a debounce.
This commit makes sure that the padding is added as soon as the composer
state changes by using a CSS custom property (variable) and transition
property for a smooth user interface.
Note this commit also introduce a new {{d-popover}} component, example usage:
```hbs
{{#d-popover |state|}}
{{d-button label="foo.things" class="d-popover-trigger"}}
<div class="d-popover-content">
Some content
<div>
{{/d-popover}}
```
- Ensure the set of rendered `<link rel=stylesheet>` tags is consistent
- Add var() references for all crawler-view styles. Basic color definitions are defined first, as a fallback for super old browsers
There are still some, but those are in actual code that's used outside core, so the change there would need to go through the deprecation cycle. That's a task for another day.
Previously we only supported a single 'required tag group' for a category. This commit allows admins to specify multiple required tag groups, each with their own minimum tag count.
A new category_required_tag_groups database table replaces the existing columns on the categories table. Data is automatically migrated.
Browsers automatically calculate an aspect ratio based on the width/height attributes of an `<img`. HOWEVER that aspect ratio only applies while the image is loading. Once loaded, it'll use the image's actual dimensions. This can cause things to jump around after loading. For example:
- if a user deliberately inserts false width/height
- the image fails to load (404)
- an optimised image is a few pixels different, due to a rounding when resizing
This decorator explicitly sets the `aspect-ratio` property so that things are consistent throughout the lifetime of all `<img` elements.
Another attempt at fixing https://meta.discourse.org/t/discourse-with-a-screen-reader/178105/88?u=osama. Previous PR (reverted): #16240.
The problems with the previous PR were:
1. As you scrolled down a topics list, the first topic of every new batch of topics would receive focus and the indicator would show up.
2. Similar to 1, clicking the `See X new or updated topics` notice would also focus a random topic from the new topics that were just loaded.
3. Topics in the suggested topics list received focus too
4. Our custom focus indicator appeared on mobile, but it shouldn't.
This commit should have none of these problems.
This reverts commit 5d77f485cb.
There are some edge cases that we need to handle better. Reverting this
commit because we're going to do a beta release later today.
