This is the first in a series of PRs to introduce a
ProseMirror-based
WYSIWYM editor experience
alongside our current textarea Markdown editor.
Behind a hidden site setting, this PR adds a toggle to the composer
toolbar, allowing users to switch between the two options.
Our implementation builds upon the excellent ProseMirror and its
non-core Markdown
module, using the
module's schema, parsing, and serialization definitions as the base for
further Discourse-specific features.
An extension API is included to enable further customizations.
The necessary extensions to support all Discourse's core and core
plugins features **will be implemented in subsequent PRs**.
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Co-authored-by: David Taylor <david@taylorhq.com>
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