fix: grid with Grouping, Row Select All shouldn't include grouping rows (#635)
fix: grid with Grouping, Row Select All shouldn't include grouping rows (#635)

- if we use Row Selection with a grid that also has Grouping/Draggable Grouping, clicking on the "Select All" button would also include grouping rows and when calling DataView `getAllSelectedIds()` it would includes some `undefined` Ids which were found to be the grouping rows. So we should fix the issue at the source, which is to NOT include the grouping rows.
6pac/SlickGrid,6pac/SlickGrid