Wrong value posted to dataset after cancelling edit by Esc-key in DbGrid

Original Reporter info from Mantis: abonic1

Reporter name:

Description:

Under certain conditions, Esc-key will will only seemingly undo changes in the DbGrid. But in the linked dataset will be posted different value, the one that was before 'Esc'.

Steps to reproduce:

Start attached demo.
Change value in the first cell from '1' to '100' and then press 'Esc' once. Changes are canceled and cell value is reverted to '1', as expected.
Press Down key (or initiate Post on some other way). The value in the first cell (and in the dataset) is now '100'.

Additional information:

Demo use TMemDataset, but the same thing happens with TSqlQuery or TZQuery.

Mantis conversion info:

Mantis ID: 29261
Version: 1.6RC1
Fixed in version: 1.7 (SVN)
Fixed in revision: 51088 (#c93f1b0a)
Target version: 1.6