Transactions

[ehfeng]

Support transactional editing

Shift+Enter to start transaction, Shift+Enter to commit, Shift+Esc or Ctrl+C to rollback.

Once a transaction is started, track the rows modified by a transaction in a Transaction Manager, storing the values for Relation.Key. If the row's key is modified, use the updated key to track the changed row. Any changes (update, delete, inserts) are highlighted in light blue. During a transaction, table borders should be dark blue.

If the transaction is rolled back, clear the Editor.previousRows: rolling back should not trigger any diff tracking highlights.

[ehfeng]

It's a bit unclear whether this feature is really necessary or useful.