Summary:
Render simple differences between documents.
* Show cell changes.
* Show cell conflicts.
* Show row additions/deletions.
Doesn't support any schema changes, and is untested in the presence of schema changes. Any widgets that access row data without using `cells` fields won't receive correct data.
Not addressed:
* Rendering conflicts in mixed row addition/updating/deleting.
* Column additions/deletions, option changes, etc.
* Document level changes.
* Table and column renames (though anticipated in ActionSummary structure).
* Page-level changes.
* Drawing attention to changes (marking changed pages+views, suppressing
unchanged rows, etc).
* Rendering differences in views other than GridView.
* Adding UI for initiating a comparison.
* Editing while comparing.
Replaces {D2600}
Test Plan: added tests
Reviewers: dsagal
Reviewed By: dsagal
Differential Revision: https://phab.getgrist.com/D2618
Summary:
This simplifies writing custom widgets that access selected
data. To access the record at which the cursor is set, and
get any future changes to it as the cursor moves or data
changes, it suffices now to do:
```
grist.ready();
grist.onRecord(record => /* render */);
```
Similarly to access the set of selected records, and get any
changes, it suffices now to do:
```
grist.ready();
grist.onRecords(records => /* render */);
```
The `records` argument will be a list of objects, each of which
is a single record. This is distinct from the column-based
representation favored in Grist up ontil now. That remains
how methods like `fetchTable` or `fetchSelectedTable` represent
their results. In the future, methods named like `fetchRecords`
or `fetchSelectedRecords` could be added that return lists.
Test Plan: extended tests
Reviewers: dsagal
Reviewed By: dsagal
Differential Revision: https://phab.getgrist.com/D2583
Summary: This moves enough server material into core to run a home server. The data engine is not yet incorporated (though in manual testing it works when ported).
Test Plan: existing tests pass
Reviewers: dsagal
Reviewed By: dsagal
Differential Revision: https://phab.getgrist.com/D2552
