Provides a way for users to actually delte their user drafts where
required.
For #3927
Added test to cover new endpoint.
Makes update to MD editor #setText so that new selection is within new
range, otherwise it errors and fails operation.
- Fixed some keybindings not running as expected, due to some editor
defaults overriding or further actions taking place since the action
would not indicate it's been dealt with (by returning boolean).
- Fixed spacing/border-radius being used on codeblocks on non-intended
areas like the MD editor.
- Fixed lack of BG on default light theme, visible on full screen md
editor.
- Fixed error thrown when the user does not have access to change the
current editor (Likely non-cm related existing issue)
- Updated clipboard handling
- Removed old clipboard package for browser-native API.
- Updated codemirror editor events to use new props for new data types.
This changes how the editors interact with the parent page-editor
compontent, which handles auto-saving.
Instead of blasting the full editor content upon any change to that
parent compontent, the editors just alert of a change, without the
content. The parent compontent then requests the editor content from the
editor component when it needs that data for an autosave.
For #3981
