Formatting was not persisted on empty paragraphs, and was instead based
upon last format encountered in selection.
This was due to overly-hasty removal of other formatting code, which
this got caught it.
Restored required parts from prior codebase.
Also updated inline format button active indicator to reflect formats
using the above, so correct buttons are shown as active even when just
in an empty paragraph.
Also:
- Added svg loading support (dummy stub) for jest.
- Updated headless test case due to node changes.
- Split out editor change detected to where appropriate.
- Added functions to help with testing, like mocking our context.
- Improved node resizer positioning to be more accurate
- Fixed drop handling not running within editor margin space
- Made media dom update smarter to reduce reloads
- Fixed media alignment, broken due to added wrapper
Changed from using a decorator to using a helper that watches for image
selections to then display a resize helper.
Also changes resizer to use a ghost and apply changes on end instead of
continuosly during resize.
Also added smarter above/below positioning to respond if toolbar would
be off the bottom of the editor, and added hide/show when they'd go
outside editor scroll bounds.
Added new options that sits on the context, for things needed but not
for the core editor, which are defined out of the editor (drawio URL,
error message text, pageId etc...)
