Before this commit chat was applying a fixed height on everything under the `/chat` route. It's only really needed on the channel page with the composer at the bottom of the page.
This commits makes the following changes:
- moves height limitation from `#main-outlet-wrapper` to `.chat-channel`
- makes browse channel page and members list page full height and rely on main document scrollbar
- adds height computation for draft header and direct message creator block to ensure the height is correct when creating a draft channel
- makes chat index full height to rely on the browser scrollbar. As a result the <kbd> + </kbd> button used on mobile to create a direct message as been moved out of `<ChannelsList>` into the chat index template
- sidebar height was relying on chat setting a max height, as a result the height computation of sidebar has been changed to work correctly, especially with an opened keyboard on mobile or ipad
- Update welcome topic copy
- Edit the welcome topic automatically when the title or description changes
- Remove “Create your Welcome Topic” banner/CTA
- Add "edit welcome topic" user tip
Change mechanism handling `more` button for sidebar.
Before it was using HTML details tag.
To make tests more reliable, we are switching to use ember runloop.
* DEV: move sidebar community section to database
Before, community section was hard-coded. In the future, we are planning to allow admins to edit it. Therefore, it has to be moved to database to `custom_sections` table.
Few steps and simplifications has to be made:
- custom section was hidden behind `enable_custom_sidebar_sections` feature flag. It has to be deleted so all forums, see community section;
- migration to add `section_type` column to sidebar section to show it is a special type;
- migration to add `segment` column to sidebar links to determine if link should be displayed in primary section or in more section;
- simplify more section to have one level only (secondary section links are merged);
- ensure that links like `everything` are correctly tracking state;
- make user an anonymous links position consistence. For example, from now on `faq` link for user and anonymous is visible in more tab;
- delete old community-section template.
This will automatically adjust when browser UI is shown/hidden (e.g. when scrolling up/down on mobile Safari).
Similar approach to c82094cd9d, which targeted the 'slide-in' version of menus.
As a single example, if a `<kbd>` tag is wrapped by a `<a>` link, it doesn't inherit the link color:
`[<kbd>❓ **Support**</kbd>](https://meta.discourse.org)`
It's because the `<kbd>` tag has a `color: var(--primary);` CSS rule which seems superfluous.
If we disable it, the `<kbd>` tag inherits all the normal colors (including the link color 👌).
The direct `<kbd>` parent that assigns the text color is `<html>` (can't go higher!) which has an identical `color: var(--primary);`.
WCAG palettes don't seem to assign specific colors in this context.
It seems fairly safe to remove `color: var(--primary);` from `<kbd>` so it won't interfere anymore with its content.
Previously, reorder on touch screens was disabled https://github.com/discourse/discourse/pull/20769.
This PR enables it again. However, link has to be hold for 300 ms to enable drag&drop. Otherwise, normal scroll is performed.
