Replacing long text with composable input has a visible delay

[f1ames]

Found while working on https://github.com/ckeditor/ckeditor5-engine/issues/403.

While diff in mutations is used only for simple mutations (inserting single character on collapsed or non-collapsed selection) it works fine for regular typing, but when character is composable one (e.g. Spanish accent or Hiragana typing) the diff function used in mutations slows down significantly:

[Reinmar]

Cool. Good to know that we can improve this if we'll introduce a fast diff.

[f1ames]

Yes, we should check if fastDiff (when merged to master) can be used here (in mutations handler) and if it can improve this situation.

[Reinmar]

Still todo?

[f1ames]

Yes, since fastDiff was already merged we may start working on this one. It will require switching from diff to fastDiff in mutations handler.

The only difference is that diff is more accurate. It finds (well, in theory at least) minimal number of changes, while fastDiff is basically a partial diff so number of insertions and deletions will usually be higher. Still it shouldn't be a problem here (we should check if it will has some effect on undo steps).

[CKEditorBot]

There has been no activity on this issue for the past year. We've marked it as stale and will close it in 30 days. We understand it may be relevant, so if you're interested in the solution, leave a comment or reaction under this issue.

[CKEditorBot]

There has been no activity on this issue for the past year. We've marked it as stale and will close it in 30 days. We understand it may still be relevant, so if you're interested in the solution, leave a comment or reaction under this issue.

[CKEditorBot]

We've closed your issue due to inactivity over the last year. We understand that the issue may still be relevant. If so, feel free to open a new one (and link this issue to it).