Use Deltas to compute Y.Text changes #41
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This filter allows external code to load its own sync provider. This can be used by both Gutenberg itself and plugins to customize the sync transport.
... but dangerously, as I don't fully understand it!
Handle invalidated CRDT docs and apply updates correctly
Supply `Awareness` instance to connection and observe changes
Allow post lock dialog to return and retain functionality
…or delta computation
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Size Change: +11.1 kB (+0.57%) Total Size: 1.96 MB
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See Automattic/vip-real-time-collaboration#55 for the related plugin PR. This PR adds a couple of important features for collaborative editing:
Instead of using
createNewYAttributeValue()to replaceY.Textvalues on string updates, we instead keep a persistentY.Textobject and update using computedDeltas. This mostly unlocks the use of Yjs relative positions which can allow cursor location updates when multiple people are typing within the same rich text area.Modified
mergeCrdtBlocks()to pass inlastSelection. Conveniently, we getlastSelectionfor free fromapplyPostChangesToCRDTDoc()which catches selection changes.The last selection location offset is fed into the
Deltadiff()function, which allows the diffing algorithm to understand where a change occurred if the update is ambiguous. Visually, this is what happens without the selection passed in:The second user's cursor doesn't move with the text, because the computed
Deltas look like this:The
diff()can only see that the whole string got longer, but has no idea where it happened. It returns aDeltaof appending a newato the end of the string as a guess.With this PR running and passing an offset hint, here's how it looks:
The sent
Deltas now match our input: