Allows bidirectional / cyclic linking for same-record cursor links.
This should allow multiple sections to all synchronize their cursors,
such that clicking in any one of them will move all the others.
Works even if some sections in the cycle have rows filtered out (the
filtered-out sections might desync their cursors, but the correct cursor
position will still propagate downstream, and they'll re-sync if clicking on
a row that is present in them)
Under the hood, each cursor has a _lastEditedAt counter, updated when
a user's action changes the cursor in a section, such that we can always
tell which section was touched most recently. This is used to resolve
conflicts stably when dealing with cycles or chains of cursor-links.
Updated selectBy and recursiveMoveToCursorPos to handle cycles
Updated tests for selectBy behavior
However, main bidirectional-linking tests are not in this commit, they'll come in a subsequent PR
There's a little nest of SelectBy tests that sometimes fail.
They are the only tests with an import of a helper function from
an other file that contains tests. Such imports have caused trouble
with mocha in the past. I'm not sure if that is the case now, but
I'd like to eliminate it as a possibility.
Summary:
- Preserving cursor position when linked state is removed.
- Moving linking tests to grist core.
- Disabling yarn offline mirror for grist-core. This helps testing grist-core when it is imported as a submodule.
- Moving one test for linked section from ReferenceColumns.ts to RightPanelSelectBy.ts.
Test Plan: Updated
Reviewers: paulfitz
Reviewed By: paulfitz
Subscribers: paulfitz
Differential Revision: https://phab.getgrist.com/D3795
